Your computer is behaving oddly — it's slow, pop-ups keep appearing, or a frightening message has filled the screen. The first thought is always the same: "Have I got a virus?" It's a worrying moment, often made worse by the very messages causing the fear. So let's sort the real warning signs from the false alarms, calmly — because the scariest messages are very often the fakes.
A genuine computer virus is quiet. The loud, scary, full-screen warnings shouting "YOUR COMPUTER IS INFECTED — CALL THIS NUMBER NOW" are almost always scams, not real infections. Real protection never asks you to phone a number or pay on the spot.
What a real problem looks like
Genuine signs that something may be wrong tend to be subtler than the dramatic warnings would have you believe:
| Possible real warning sign | But first, consider… |
|---|---|
| Computer suddenly much slower than usual | Often just a full drive or too many programs — not a virus |
| New toolbars or a changed home page you didn't set | Usually "unwanted software" bundled with a download — a real but mild nuisance |
| Pop-up adverts appearing even when not browsing | A sign of "adware" — worth cleaning, rarely dangerous |
| Friends receiving odd emails "from you" | Often your email password was guessed, not a virus on the PC |
So what? Most "virus" symptoms turn out to be something milder and easily fixed. Don't let the word frighten you into rash action.
What is almost certainly NOT a virus
Commit these to memory, because spotting them saves people a great deal of money and worry:
- A full-screen warning that you can't close, with a phone number to call. Fake.
- A loud alarm sound and a voice telling you not to turn off the computer. Fake.
- A message claiming to be from "Microsoft" or "Apple" asking you to call or pay. Fake — they never do this.
- An email saying your account is suspended, with an urgent link. Almost always a scam.
If a scary warning fills the screen and won't close, do not call the number and do not click anything. Simply restart the computer (hold the power button for a few seconds if you must). The fake warning is just a web page — it vanishes on restart, and your computer is fine.
So what? The fakes rely on panic. Knowing they're fake removes their power entirely.
How to actually check and clean your PC
If you'd like peace of mind, Windows has its own free, capable protection built in — you don't need to buy or download anything.
- Click the Start button and type "Windows Security", then open it.
- Click "Virus & threat protection".
- Click "Quick scan" and let it check your computer.
- If it finds anything, follow its prompts to remove it — it does the work for you.
This is the genuine article, already on your computer. Be wary of any other "antivirus" that pops up uninvited demanding payment — that's often the very thing causing the trouble.
So what? Real protection is quiet, free, and built in. You rarely need anything more.
If you think you've been caught out
If you did call a number, let someone connect to your computer, or shared a password — don't be embarrassed; it happens to careful people every day. Act quickly:
- Disconnect from the internet (turn off Wi-Fi) and restart the computer.
- Change the passwords for your email and banking from a different device.
- Ring your bank straightaway if any money details were shared.
- Report it to Action Fraud (0300 123 2040) — the UK's fraud reporting service.
Worried your computer's caught something, or just want a second opinion? Describe what you're seeing — a photo helps — and we'll tell you honestly whether it's a real problem or a false alarm, free of charge. Visit Ask IT Man.
What should I do?
- Stay calm — the scariest messages are the fakes.
- Never call a number or pay because of an on-screen warning.
- Restart the computer to clear a fake full-screen warning.
- Run a Quick scan in the free, built-in Windows Security.
- If caught out, change passwords from another device and ring your bank.
A genuine virus is rare, and rarely the disaster it's made out to be. Knowing the fakes for what they are is the best protection of all — and now you do.
