How to Tell If Your Computer Has a Virus (And What to Do About It)

Computer viruses and malware are more sophisticated than ever in 2026. AI-generated phishing emails are nearly indistinguishable from real ones, and new malware variants appear daily. Here's how to identify an infection and remove it safely — and more importantly, how to prevent the next one.

Warning Signs Your Computer Is Infected

1. Unexpected pop-ups — especially ones claiming your computer is infected (ironic, right?). These often appear as browser notifications you accidentally allowed.
2. Dramatically slower performance — malware uses your CPU and RAM. Cryptominers are particularly resource-hungry.
3. Programs you didn't install — check your installed programs list in Settings → Apps. Anything unfamiliar should be investigated.
4. Browser redirects — your searches go to strange websites, or your homepage changed without your permission.
5. Disabled antivirus — some malware disables Windows Defender or your third-party antivirus as its first action.
6. High network usage — malware often communicates with remote command-and-control servers. Check Task Manager → Performance → Open Resource Monitor → Network to see what's connecting out.
7. Ransom messages — ransomware encrypts your files and demands payment, usually in cryptocurrency.
8. Strange emails sent from your account — if contacts report receiving spam from you, your email or computer may be compromised.
9. Webcam light turns on unexpectedly — some malware activates your camera for surveillance.

Step-by-Step Virus Removal

Step 1: Disconnect from the Internet This prevents the malware from spreading to other devices on your network, sending your data to attackers, or downloading additional malicious payloads. Unplug your Ethernet cable or turn off WiFi.

Step 2: Boot into Safe Mode Safe Mode loads Windows with only essential drivers and services, preventing most malware from running. Restart and hold Shift while clicking Restart. Go to Troubleshoot → Advanced Options → Startup Settings → Enable Safe Mode with Networking.

Step 3: Delete Temporary Files Before scanning, clear your temp files. Open Disk Cleanup and select all temporary file categories. This speeds up the scan and removes some malware that hides in temp folders. Press Win+R, type %temp%, and delete everything in that folder as well.

Step 4: Run Multiple Scans No single scanner catches everything. Run these in order: 1. **Windows Defender** — full scan (built-in, free) 2. **Malwarebytes** — free version, excellent at catching what Defender misses 3. **AdwCleaner** — specifically targets adware and browser hijackers (free, by Malwarebytes)

Let each scanner quarantine everything it finds. Don't delete quarantined items immediately — false positives happen.

Step 5: Check Your Browser Reset your browser settings to default. In Chrome: Settings → Reset settings → Restore settings to their original defaults. Remove any extensions you didn't install. Clear your cache and cookies. Check that your default search engine hasn't been hijacked.

Step 6: Check Startup Programs Open Task Manager → Startup tab. Disable anything you don't recognize. Right-click suspicious items, select "Open file location" to see where they live on your drive.

Step 7: Update Everything After cleaning, update Windows, your browser, and all software. Vulnerabilities in outdated software are how most malware gets in. Enable automatic updates wherever possible.

Preventing Future Infections

The best virus removal is prevention. Follow these practices:

When to Call a Professional

If you see ransomware, if your files are encrypted, or if the malware keeps coming back after removal — call a professional. Never pay ransom demands — there's no guarantee you'll get your files back, and you'll be marked as a paying target for future attacks. NeighborTechs has recovered data from ransomware attacks and deeply embedded rootkits. We can also set up proper protection to prevent future infections. Call (804) 898-5939.