19 Best Free Diagnostic Applications for Windows


Today, we have collected and presented to you the best free diagnostic applications that will help you research, evaluate, repair (windows problems) or check your computer hardware, such as processors, memories, graphics cards, hard drives and but.



Test every component of your computer using 6 powerful, efficient tests! CPU, memory, GPU, VRAM, power supplies, every critical component can be tested. OCCT is a free tool for measuring the performance and stability of your computer. It has 4 built-in test panels targeting CPU, GPU and power. 

It also monitors temperatures, voltages, fan speed, as well as memory usage and frame rate (FPS) (3D test). It has the most accurate error detection algorithm for CPU and GPU. 

Even though components are currently well protected from overheating, OCCT includes another layer of safety by allowing you to set a maximum temperature limit. OCCT's CPU test is the most advanced out there. 

Capable of detecting stability issues in seconds, it can perform per-core testing and allow you to adjust the instruction set used and data size.

Victoria HDD - SSD


Free program designed to diagnose and repair hard drives, SSD drives, memory cards, and other drives in Windows. It is a remarkable, quite useful program that monitors the performance of your hard drive and gives you solutions in case of problems. 

You can examine your disks for various problems and if any are found then the application has the ability to repair them. It can analyze and display details about your storage media, including disk size, serial number, and more. The application may redirect, restore, ignore or delete the data in the sectors that have errors or delete the data and correct it. 

 A powerful HDD surface scanner is built into the program, which allows you to diagnose the drive for bad areas, defects and interface errors. It is able to test almost all discs regardless of their type. A feature of the scanner is the use of special algorithms for automatic adjustment of time limits and block size, which allows you to efficiently scan both slow and fast disks. 

The graph is based on 188 points, evenly distributed over the tested volume of the drive. The result is visually and numerically identical to a full 4-hour scan, except for finding defects. 

It is used to study known good drives to measure the main parameters: speed at the beginning and end, access time, behavior in different block sizes, as well as to compare different devices in terms of technical characteristics. Charts can be saved to files and loaded back into the program. (The website is in Russian language)



Looking for a simple, free, reliable tool to measure the speed of your flash drive while also checking its integrity, you can trust Check Flash. This is a simple, portable application, through which we can measure the write and read speed for any USB stick and at the same time we will check if there is a problem. 

To get started, download the program, unzip it and run the application, select your stick and press Start to begin testing. The user can choose one of the three types of access types that are available. 

Each type of access allows you to perform specific tests and provides useful data. After the check is complete you will see the average read and write speed for your stick and information about any errors found on your drive. 

CAUTION : The app allows you to run all the tests listed above as well as the full wipe test. Make sure to backup your data because the device needs to be formatted after the testing process.

CheckDrive 2023


CheckDrive is a modern software offering you an easy way to check your computers hard drives for errors. It displays information about your drives in real time and monitors your hard drive values ​​throughout its operation and notifies you immediately after any errors occur, so you'll know right away if something goes wrong with your hard drive. 

To check if a hard drive has errors, run the application and you'll see a question mark next to each drive, which means the drive hasn't been checked yet. Now click on the Check button and if everything goes well you will see the indicator indicating that your disk has no problem. It will also work for SSD drives. To use the application you must register.



Defective RAM can cause many problems on a computer, including corrupted data, crashes, and unexplained behavior. Bad RAM is one of the most frustrating problems as the symptoms are often random and hard to detect. MemTest86 however, is a great diagnostic that can help diagnose faulty RAM (or rule it out as the cause of system instability). Therefore it is often used by PC repair shops, overclockers and computer manufacturers. It boots from a USB flash drive or CD and checks the RAM on your computer for errors using a series of comprehensive algorithms and test patterns

Video Memory stress test


Video Memory stress Test is designed to test the RAM for your graphics card. Similar to Memtest86+, it will read and write the data to every part of the RAM on your graphics card and allow you to fully test the VIDEO RAM (DirectX access). 

It is probably the best way to check the stability of the graphics card after overclocking. There are three types of tests (DirectX, CUDA and OpenGL), plus a number of options. You can also choose the size of the surfaces, or if you want in case the program finds an error a sound will also be heard at the same time. A full test takes about 30 minutes, however you can choose from the test set controls with a much shorter time.

Windows Repair Toolbox


Download and run "on-the-fly" the best free portable software for diagnosing and solving various kinds of Windows problems. The tools included in the program are categorized by their function, and the program will automatically download the correct version of the programs you want to run for your version of Windows. 

When you're done, just close the app and all your downloaded apps will be automatically removed. The programs include various security programs as well as programs that allow you to display information about your computer such as the temperature of your processor, the amount of RAM in your system, how much memory you have left, the free space on your hard drives, and finally gives you one-click access to some useful Windows tools (chkdsk, SFC, regedit, msconfig ).

SiSoftware Sandra Lite


Excellent diagnostic program with which you will discover every "hidden" aspect of your computer, allows you to fully control not only the hardware but also make Benchmarks on your processor, your memory on your hard drive, etc. π to see the differences between your computer hardware and others. In conclusion, this is a unique diagnostic tool that you should all have.

MediCat Multiboot DVD


MediCat DVD Multiboot Linux DVD is a Windows PE-like boot software that aims to replace the best-of-time Hiren Boot CD / DVD diagnostic software, which has been discontinued since 2012. It is the best diagnostic software. tool that can help you diagnose and troubleshoot Windows. 

It is available absolutely free of charge and includes a large number of diagnostic and utility programs. Powerful and absolutely useful as it allows you to edit the Windows registry, reset Windows passwords, transfer files from an unbootable computer, delete or modify partitions, and much more.

There are four versions of MediCat available, MediCat DVD which is the main distribution and includes the PortableApps Suite with many useful applications, MediaCat DVD -NAKED with the same interface as the MediCat DVD but does not include the PortableApps Suite, the Mini Windows 10 x 64 with bootable Windows 10 WinPE boot environment and PortableApps Suite and Mini Windows 10 x 64 NAKED which is like the previous one but does not include PortableApps Suite.

Before you start download and install the program, and Rufus (we will need to copy the application DVD to a USB stick to start from).

All In One - System Rescue Toolkit


The All in One System Rescue Toolkit Lite is designed as a first stop solution for repairing computers running Windows. It automatically runs various stages of diagnosis and repairs and is able to determine and solve many problems in Windows. 

While we can't guarantee that you'll fix the specific problem you may be experiencing, this may be the first step before you need to call a technician. You don't need to be an expert to use it because all the repair work is done automatically. 

All you will need is to simply run it and wait until the check and repair process is completed. The repair steps include checking basic and minor functions in Windows and are as follows: CPU / Cooling test, memory test, hard disk function test, Windows Security Center test, virus scan, network function test and system restore, file check system, disk cleanup and Defrag. 

In addition to the lite version you can download the full technician version aimed at advanced users through which you can literally do almost everything. For this purpose you will need to download the Live CD of the application and burn it to a CD through which you will Boot, however, the main menu with the necessary tools can also be run from windows. 

Which in particular, if you have WINDOWS 10 or 11 after downloading the ISO of the Live distribution right click on it and press mount. Alternatively, for even better results, unzip the contents of the ISO to a folder and run it from there. 

In the folder that will open right click on the AiO-SRT file and run it with administrator rights. To download the application click on All in One - System Rescue Toolkit and download, select technician version and from the download option, select the location from where you will download the application.

Dead pixel tester


Free app that can help you fix pixels stuck on your screen. You can download the installer or download the portable version completely free! It can fix stuck pixels by quickly cycling the color value of the stuck pixel. 

However, please note that this tool does not provide a 100% success rate. Start by pressing the first START selecting the colors one by one and observe where the problem is on your screen (to exit press ESC), now in case you find a problematic Pixel press the second START and move the window with the colors that flash to the spot with the problematic Pixel. 

Let it work for some time, now if everything went well the problem will be fixed. For the application to work properly, run it with administrator rights.

HardDisk Validator


This is a simple utility designed to help you find out if your hard drive has reached the end of its life and if it is possible to repair any bad sectors. However, before we continue about the program let's do a little recap.

What is a bad sector? As hard drives are known to write data in block units (sectors), every time a hard drive updates a sector, it also updates a checksum (stored immediately after the sector data).

When a sector is read from your hard drive, it is expected that the sector checksum will match the sector data, if it does not, then most likely bad sectors have been created.

The appearance of bad sectors can come from either a power outage during recording or from some other malfunction of the hard disk for some other reason such as falling, mechanical damage and others.

The question that arises is this: Can bad sectors be repaired? NOT always, however, if the data stored in the sector is simply invalid, but your hard drive is working properly, you can repair the bad sectors that have been created. 

However, before you start you should first see if your disk has bad sectors. For this purpose, run the HardDisk Validator application, select Read and press Start to start the diagnosis.

If you see that there are bad sectors which you found to be created recently, for example after some power failure run the application and select "Read + Wipe Damaged + Read" is the fastest way to eliminate the bad sectors and avoid any problem with software that does not respond well to bad domains. 

If something appears to be wrong with the drive, it is best to back up the data and use the "Write + Verify" test, which will erase all data on the drive.

CAUTION : If you use a single disk to boot your operating system you can run the scan to see if your hard disk has bad sectors, however, it is recommended that you avoid trying to repair it if it is the one that hosts your current operating system . In this case, what you can do is disconnect your hard drive and connect it as a second one, to another computer and run the program there.

Possibilities of the application

  1. Read: It will scan the entire surface of the hard disk to detect bad sectors.
  2. Read + Wipe Damaged + Read: Scans the entire surface of the hard drive to find bad sectors, if bad sectors are found, they will be replaced and re-read to make sure they were successful this time around.
  3. Read + Write + Verify + Restore: The program will write a test template to disk, verify that the template was successfully written, and then restore the original data.
  4. Write + Verify: The program will write a test template to disk and verify that the pattern was successfully written. (original data will be lost).



Simple yet reliable software to help you test your graphics card in Windows. It's also a fast OpenGL benchmark (online benchmarks). This way you can test the performance and stability of your graphics card. It uses special performance algorithms to measure the performance of your graphics card, specially tailored to push the graphics card to its limits.



Powerful tool for finding and repairing hard disk errors. It is quite similar to Disk Checker or Chkdsk. exe, provided with Windows operating systems (Windows 2000, XP, Vista, 7, 8, 10,11 Server 2012. You can choose either standard or full tests. The full test additionally performs a domain check. It is able to find bad sectors on your disk and mark them as such.The program works with both hard disks (including SCSI and RAID) and removable media.You run it with administrator rights.

Hiren's BootCD PE


This is the best Boot CD that contains a multitude of tools (freeware) with the help of which we can do diagnostic tests and checks that will help us restore our PC in case of failure. Hiren's BootCD PE (Preinstallation Environment) is a revamped version of Hiren's BootCD based on Windows 10 PE x64. 

It includes the best and updated free tools used in Hiren's BootCD. It supports booting from UEFI and requires a minimum of 2GB of RAM. With the useful tools inside the ISO, you can solve many problems related to your computer and it includes only free, legal software. 

After startup, it will try to install drivers such as graphics, sound, wireless card and ethernet card for your hardware. After downloading the program burn it to a CD-DVD and Boot from it, now depending on what you want to do select the corresponding task. 

To format and install the application on a USB stick you can use the portable BootCD PE-ISO2USB tool, download it from here. It will work on all Windows from Windows 7 and above. Alternatively download the iso and boot the CD from it windy

RightMark Audio Analyzer


Audio measurement diagnostic program that performs various tests on the performance of sound cards, in this way we are given the opportunity to measure, evaluate and compare the performance of sound cards. You may need to run it with administrator rights to install it. 

To test audio devices, the program uses frequency analysis algorithms. It can perform both playback and recording tests for the computer's sound card or other audio equipment, thus detecting possible output distortions. After all tests are completed, you can see the values ​​of all selected parameters in the "test results" window. 

One advantage is that you can load test results for multiple devices, which allows you to compare them. Additionally, each set of results can be viewed and analyzed using spectral graphs.



System rescue disk available as a bootable CD-ROM or USB stick to manage or repair your computer's system and data after a serious problem. 

It aims to provide an easy way to perform administrative tasks on your computer, such as creating and editing your hard disk partitions. It comes with a large number of parted programs, partimage, fstools, and basic tools (editors, midnight commander, network tools). 

It can be used on both Linux and Windows computers and requires no installation as it can be booted from a CD, DVD or USB stick, but can still be installed on your hard drive if you wish. The kernel supports all popular file systems (ext2/ext3/ext4, reiserfs, btrfs, xfs, JFS, vfat, ntfs), as well as network file systems (samba and nfs).

GFX Memory


Free benchmarking and evaluation application of RAM speed capabilities on computers running Windows. Shows system RAM speed at average and maximum read and write speeds. A very useful tool that will help us see the capabilities of our computer's RAM memory and make a comparative evaluation between different types of memory as well as the difference in speed or not in case we want to overclock our computer. However, we should note that the results should only be compared on the same computer running the same version of the GFX Memory Speed ​​Benchmark.

Ultimate Boot CD


One of the best free tools, with a multitude of programs and utilities to diagnose and repair problems for a computer. It gives us the possibility to check all the Hardware, see information, make Partition, etc. After downloading the program, write it to a CD and boot from it. 

The collection is extensive and includes CPU and RAM testing tools, evaluation tools, hardware identification, system information, benchmarks, BIOS tools, hard drive diagnostics, hard drive management software, erasing and cloning programs , partition as well as boot managers, network tools and various Linux and DOS boot disks. 

The CD also includes a program to make a copy to a USB stick so you can use it even on computers without built-in CD drives.

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