🛡️ Computer Security: Practical ways to protect against viruses and malware
The complete guide to keeping your computer safe
📋 Article Contents
- ⚠️ What are viruses and malware?
- 🔍 How do I know I have a problem?
- 🛡️ Protection Plan Selection
- (I.e. The importance of updates
- 📧 Secure Email and Phishing
- 🌐 Safe Internet Browsing
- (I.e. Generating Strong Codes
- (I.e. Backups
- 📱 Secure File Downloads
- 🔧 Useful Protection Tools
- ???? What do I do if I get infected?
- ✅ Safety Checklist
⚠️ What are viruses and malware?
📌 Is your computer freezing, slow, or displaying strange messages?
Before you panic, it's good to know what might actually be going on. Many of these problems are due to viruses and malware, which have increased significantly in recent years.
The malware is a general term for programs that are designed to work against you. They can steal personal information, corrupt files, or use your computer without your knowledge. Simply put, they are "bad" programs that you don't want on your system.
Such programs can enter your computer in many ways: from suspicious files you download, fake emails, infected websites, or even from programs that look normal and harmless. That's why proper information and prevention are more important than ever.
🧩 The most common types of malware
🦠 Viruses
Viruses "attach" themselves to files or programs. When you open or transfer them, they spread and cause problems. They can delete files, crash the system, or even prevent the computer from starting properly.
🐴 Trojan Horses
They appear as useful programs or updates, but in reality they hide dangers. Once installed, they can allow third parties to access your computer without you knowing.
🔓 Ransomware
It locks your files and demands money to unlock them. It is one of the most serious threats today. Even if you pay, there is no guarantee that you will get your data back. That is why backups are lifesavers.
🕵️ Spy Software
It tracks what you do on your computer without you knowing. It can record keystrokes, passwords, or the websites you visit. It is insidious because it often operates “silently.”
📢 Advertising Software
It constantly displays ads and pop-ups. It usually does not damage files, but it makes the computer slow and annoying and can lead you to dangerous pages.
🔍 How do I know that something is wrong?
Usually the computer "talks" before a serious problem occurs. If you see any of the following, it's a good idea to check:
- The computer is extremely slow for no reason
- Ads keep appearing
- The homepage or search changes on its own
- There are programs you don't remember installing.
- The disk keeps working without use
- Files are missing or won't open
- Sudden restarts or freezes
- The protection program closes by itself
- Strange messages are being sent from your account
🛡️ How do I choose a protection plan?
A security program acts like a watchdog. It monitors what you open, what you download, and which pages you visit, in order to block threats before they become a problem.
Free or paid?
Both options can cover basic needs. The difference is how much complete protection you want in everyday use.
| Feature | Free | On Payment |
|---|---|---|
| Basic Protection | ✅ Yes | ✅ Yes |
| Continuous Monitoring | ✅ Yes | ✅ Yes |
| Network Protection | ❌ No | ✅ Yes |
| Email & Scams | ❌ Limited | ✅ Complete |
| Support | ❌ No | ✅ 24/7 |
| Secure connection | ❌ No | ✅ Usually yes |
| Cost | Free | 30–80€ / year |
⭐ Popular Protection Programs
Windows Defender (Microsoft)
Free – Built into WindowsWindows Defender is already installed on all modern Windows computers and is automatically enabled from the moment you turn it on. It offers reliable basic protection against viruses, suspicious files, and dangerous websites, without requiring any configuration from you.
Ideal for beginners, for simple everyday use, internet surfing, email and office work.
Avast / AVG
Free & PaidTwo of the most well-known security programs in the world. The free version offers good basic security, but displays ads and notifications.
Paid versions remove the hassles and add extra protection for shopping, email, and more dangerous websites.
Bitdefender
On Payment (approximately €40 / year)It is considered by many to be one of the top protection programs today. It offers a very high level of security, while remaining lightweight and not "burdening" the computer.
Suitable for users who frequently make online purchases, bank transactions or want the maximum possible protection.
Kaspersky
On Payment (approximately €35 / year)It offers excellent protection and many additional security features. It detects threats very effectively, but on older computers it may seem a bit "heavy".
Nevertheless, it remains a very reliable option for demanding users.
Norton 360
On Payment (approximately €50 / year)A complete all-in-one solution. In addition to virus protection, it includes additional internet security, password tools, and extra privacy features.
A good choice for families or users who want everything concentrated in one program.
🔄 The importance of updates
Updates act like “security patches.” When a vulnerability is discovered, manufacturers release updates to close it and protect your computer. If you ignore them, you’re essentially leaving the door open to risks.
Windows Updates
Windows usually updates automatically, but often requires a restart to complete the process. Don't put it off., especially when it comes to security updates.
How do I check: Settings → Windows Update → Check for updates
Program Updates
Programs like your browser, PDF reader, or video player should always be up to date. Old versions often have known security issues.
Helpful tip: Enable automatic updates where available.
Protection Program Updates
Your security program needs frequent updates to identify new threats. They are usually done automatically, but it is a good idea to check it every now and then, especially if you have time to open its settings.
📧 Secure Email & Phishing Scams
Email scams are today's most common way to infect a computer or steal personal information. These are fake messages that try to scare you or trick you into clicking on a dangerous link.
🚨 How do I recognize a suspicious email?
- Requests immediate action (“Your account will be closed today!”)
- Asks for passwords, card details, or personal data
- The sender address looks strange or irrelevant
- It has a lot of spelling or "broken" Greek
- Contains attachments you weren't expecting
- Promises money, gifts, or refunds
✅ What to do in practice
- Hover over the link to see where it leads.
- Do not open attachments from unknown senders.
- Never respond to such emails.
- Contact the company directly from the official site
- Use "Report as spam"
“Your account will be deactivated in 24 hours – confirm here.” No serious company asks for verification of information in this way.
🌐 Safe Internet Browsing
The internet is full of useful information, but also traps that target unsuspecting users. With a little care, most problems are easily avoided.
🔒 Always check the page address
- The address should start with https://
- Show the lock icon
If there is no padlock, never enter codes or payment details.
🚫 What is good to avoid
- Websites that distribute paid programs for "free"
- Messages saying "your computer has a virus"
- Downloads from unknown or suspicious pages
- Illegal files and programs
- Streaming from pages full of pop-up ads
- Use ad blocking
- Enable browsing protection in the browser
- Don't store passwords on public computers
- Periodically clear cookies and history
🔑 Create Strong Passwords
The codes are the first line of defense of your digital life. A weak password is like leaving your house unlocked. Yet, many users continue to use very simple passwords.
❌ Bad passwords (avoid them)
- 123456, password, 123456789
- Your name or date of birth
- Children's or pet names
- Simple words ("house", "cat")
- Consecutive characters (abcd, 1234)
✅ What a good password looks like
A secure password should have:
- At least 12 characters
- Uppercase and lowercase letters
- Numbers
- Symbols (!@#$%^&*)
- No personal information
💡 Smart way to create a password
Create a phrase that you can easily remember:
"My cat's name is Mitsos and he was born in 2020!"
Keep the basics:
Happy New Year 2020!
So you have a strong password, difficult for others but easy for you.
📱 Password Managers
Password managers work like a digital safe. They securely store all your passwords and free you from the stress of remembering them or writing them down somewhere. In practice, you only need to remember a basic code.
They are particularly useful when you have many accounts (email, social media, banks, shopping), as they create and strong passwords automatically.
Bitwarden
Free & PaidAn excellent free solution that covers the needs of most users. It works on computer, mobile and browser, synchronizing your passwords everywhere.
Very good choice for those who want security without cost.
1Password
On Payment (approximately €36 / year)Very user-friendly, with a clean environment and excellent organization. Ideal for families or professionals managing multiple accounts.
LastPass
Free & PaidPopular choice with a good basic version. Suitable for simple everyday use, although the free version has some limitations.
💾 Backups
Backups are the last and most important safety netViruses, disk failures, or human error can happen at any time. If you don't have a backup, your files can be lost forever.
📋 The 3-2-1 rule
- 3 copies of your files
- 2 different storage media
- 1 copy outside the home or online
💡 Practical ways to create backups
External Hard Drive
The simplest and most economical way. Connect the drive and the files are automatically copied. Ideal for photos, documents and videos.
Route: Settings → Backup
Cloud storage
Your files are stored online and accessible from anywhere. Even if your computer breaks down, your data remains safe.
- Google Drive: 15GB free
- OneDrive: 5GB free
- Dropbox: 2GB free
Automatic Full Backup
Special programs can keep a complete copy of the system. So, in the event of a serious problem, the computer returns exactly as it was.
📱 Secure File Downloads
Many infections start with a simple file we downloaded in a hurry. With a little care when downloading, most problems can be avoided.
✅ Reliable sources
- Official manufacturer websites
- Microsoft Store
- Ninite for basic programs
- Well-known and trusted download pages
❌ Files that need attention
- .exe, .bat – only from completely trusted sources
- .scr files
- Compressed files with password
- Documents requesting activation of functions
🔍 Before opening any file
- Scan it with your security program.
- Think about whether you really expected it.
- Check if the size is reasonable
- Do additional checking if in doubt.
🔧 Useful Safety Tools
In addition to the basic protection program, there are additional tools that significantly enhance the security of your computer, especially in cases where something has slipped through.
Malwarebytes
Free & PaidVery effective tool for detecting and cleaning threats that may not have been detected by the main antivirus. Ideal as a "second opinion".
Windows Firewall
Built-inIt controls which programs communicate with the internet. If it is disabled, the computer remains exposed. It must always be active.
VirusTotal
Free OnlineIt allows you to check a file or link with multiple protection tools at once, before opening it on your computer.
🚨 What to do if your computer is infected
If you suspect something is wrong, don't panic. Calmly follow the steps below to limit the damage.
Disconnect from the Internet
Turn off Wi-Fi or unplug the network cable. This stops the threat from communicating with the outside environment.
Booting into Safe Mode
Press the Power button, hold it down Shift and select Restart. Then: Troubleshoot → Advanced options → Startup Settings → Restart → press 4.
In this mode, most malware is not activated.
Full Scan
Do a full scan with your antivirus. If you don't have it or it doesn't open, download Malwarebytes from another computer and transfer it via USB.
Removing Suspicious Programs
Go to: Settings → Apps → Apps & features and remove anything you don't recognize or was recently installed for no reason.
Change Passwords
After the system is cleaned, change all your important passwords, starting with email, banking, and social media.
Update Everything
Update Windows, programs, and antivirus to close potential security gaps.
In severe cases, the safest solution is to completely reinstall Windows. Before doing so, save as many files as you can and check them carefully. If you are unsure, ask a technician for help.
✅ Quick Security Check
Use this list to see how well protected your computer is.
🎯 Your Security Score
Each "yes" = 1 point.
Basic Protection (0–5 points)
- Antivirus installed and updated
- Automatic Windows updates
- Firewall active
- Strong passwords (12+ characters)
- Be careful with emails and links
Medium Protection (6–10 points)
- Different codes for each service
- Two-step verification (2FA)
- Regular backups
- Check privacy settings
- Using ad blocking
Advanced Protection (11–15 points)
- Using a password manager
- Automatic backups to cloud & disk
- Check with a second tool
- Regularly check installed applications
- Safe use of public Wi-Fi
- 0-5: ⚠️ Immediate improvement needed
- 6-10: 👍 Good base, keep going
- 11-15: 🏆 Very high level of security
🎯 Conclusion
Computer security is not something that happens once, but a continuous processThe best antivirus is you: attention, information, and good judgment. Stay safe!
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