How to Remove a Virus From Your Computer
How to Remove a Virus From Your Computer
How to Remove a Virus From Your Computer
Your computer is running slowly. Strange pop-ups keep appearing. Your browser redirects to websites you’ve never heard of. Programs you didn’t install are sitting on your desktop. Something is wrong.
Malware is one of the most common computer problems we deal with in St Andrews – and students running pirated software are our most frequent customers for it. Here’s how to spot it, what you can try yourself, and when to bring it in.
Signs Your Computer Has Malware
- Slow performance – Your computer was fine last week and now everything takes forever to load. Malware running in the background eats CPU and memory.
- Pop-up ads – Ads appearing on your desktop or in your browser even on websites that don’t normally show ads. Especially suspicious if they appear when your browser is closed.
- Browser redirects – You search for something on Google and end up on a completely different search engine or a suspicious website.
- Programs you didn’t install – Unknown applications in your start menu, taskbar, or system tray that you don’t remember putting there.
- High CPU or fan usage when idle – If your fans are spinning loudly when you’re not doing anything, something is using your processor. Open Task Manager (Ctrl+Shift+Esc) and look for unfamiliar processes using high CPU.
- Your antivirus is disabled – Some malware specifically targets and disables Windows Defender or other security software to prevent itself from being detected.
- Ransom messages – If you see a screen telling you your files are encrypted and demanding payment in cryptocurrency, that’s ransomware. Stop using the computer immediately and bring it in.
Common Types of Malware
Viruses
Programs that attach themselves to files and spread when those files are opened or shared. Traditional viruses are less common now but still exist.
Trojans
Software that looks legitimate but contains hidden malicious code. That “free” version of Photoshop? Probably came with a trojan. This is the most common type we see.
Adware
Injects advertisements into your browser and desktop. Annoying rather than dangerous, but it can slow your computer significantly and some adware tracks your browsing habits.
Ransomware
Encrypts your files and demands payment to unlock them. This is the most destructive type. Do NOT pay the ransom – there’s no guarantee you’ll get your files back, and paying funds criminal operations.
What You Can Try Yourself
Run a Full Windows Defender Scan
Open Windows Security, go to Virus and Threat Protection, and run a full scan – not a quick scan. A full scan checks every file on your computer and can take an hour or more. Let it finish completely.
Download and Run Malwarebytes Free
Malwarebytes catches things that Windows Defender sometimes misses. Download the free version from malwarebytes.com (make sure you’re on the real site, not a lookalike). Run a full scan and let it quarantine anything it finds.
Check Your Installed Programs
Go to Settings, then Apps and Features. Sort by install date and look for anything you don’t recognise or didn’t intentionally install. Uninstall anything suspicious.
Check Your Browser Extensions
Open your browser’s extension or add-on page. Remove anything you don’t recognise or didn’t install yourself. Malicious browser extensions are a major source of redirects and pop-ups.
When to Get Professional Help
Bring your computer to us if:
- You have ransomware – Do not attempt to fix this yourself. Do not pay the ransom. We can assess whether your files are recoverable and clean the infection properly. We offer data recovery for situations where files need to be rescued.
- The infection keeps coming back – If you clean it and it returns within days, you’re dealing with a rootkit or a persistent infection that’s embedded deeper than consumer antivirus can reach.
- Your antivirus won’t run – If malware has disabled your security software and you can’t re-enable it, the infection is actively defending itself. This needs manual removal.
- You’re not sure what’s safe to remove – If you’re worried about accidentally deleting something important, let us handle it.
How We Remove Malware
Our virus removal process goes beyond just running an antivirus scan:
- Full malware scan with multiple professional tools
- Manual inspection of startup programs, scheduled tasks, and registry entries
- Browser reset and extension cleanup
- Windows system file repair if the OS has been damaged
- Data backup to make sure your files are safe
- If the infection is too deep, we can back up your data and do a clean OS reinstall
How to Avoid Getting Infected Again
- Don’t open email attachments from unknown senders – This is still one of the most common infection routes. If you weren’t expecting it, don’t open it.
- Keep Windows updated – Security updates patch the vulnerabilities that malware exploits. Turn on automatic updates and don’t skip them.
- Avoid pirated software – This is a huge one for students. That cracked copy of Microsoft Office, Adobe Creative Suite, or a game torrent is one of the most common malware delivery methods we see. The “crack” IS the virus.
- Use an ad blocker – Malicious ads (malvertising) on legitimate websites can deliver malware. uBlock Origin is free and effective.
- Be cautious with USB drives – Don’t plug in USB drives you find lying around. This sounds paranoid, but infected USB drops are a real thing.
Mac Users Aren’t Immune
Macs are less targeted than Windows PCs, but they absolutely can get malware. Adware and trojans on macOS are increasingly common. If your Mac is behaving strangely, the same principles apply – run a scan, check your applications, and bring it in if you can’t resolve it.
Computer Repair in St Andrews
If your computer is infected and you can’t shift it yourself, bring it to us. We’ll clean it properly and make sure it stays clean.
Repair St Andrews, 1 City Rd, St Andrews, KY16 9XQ. Call 01334 478866 or walk in. Open Monday to Friday 09:30-17:30, Saturday 10:00-17:00.
