A virus rarely announces itself. It shows up as a handful of small annoyances that are easy to shrug off, right up until your files, passwords, or bank login are the thing at stake. If your computer has been acting off, here are seven signs worth taking seriously, and what to do about each.
- Sudden slowdown, uninvited pop-ups, or a changed browser are the three most common early tells.
- Never click a pop-up, not even the X in the corner. Close the whole browser instead.
- A screen demanding payment is ransomware. Don't pay, and disconnect the machine right away.
- If accounts start sending messages you never wrote, change passwords from a different, clean device.
- A real cleanup finds what's hiding and closes the door the infection came in through, not just the one file antivirus flagged.
1. It got slow, fast
Machines slow down as they age. That's gradual. A virus is different: your computer was fine last week and now it crawls through things it used to breeze past. Malware runs hidden processes that eat your CPU and memory, so everything else has to wait its turn.
Slowness alone isn't proof. If nothing else on this list rings true, the cause might just be a full drive or a tired machine. Our how to speed up Windows 11 guide covers the innocent explanations.
2. Pop-ups you didn't ask for
Ads on your desktop, or your browser filling up with them, especially the ones warning you about "infections" or dangling a prize. That's adware. Don't click them, not even the little X in the corner. The close button is often part of the trap. Close the whole browser instead.
3. Your browser changed on its own
A homepage you never set. A search engine you don't recognize. A new toolbar or extension you don't remember installing. That's a browser hijacker, and it's usually feeding your searches somewhere you wouldn't like.
4. Programs crash or won't open
Apps freezing, refusing to launch, or the whole machine restarting on its own. Malware messing with system files is one cause. So are failing hardware and a corrupt Windows install, so this one needs a proper look rather than a guess.
5. You're locked out and something wants money
A screen demanding payment to get your files back is ransomware, and it's the worst thing on this list. Don't pay. Paying funds the next attack and often gets you nothing.
If files are encrypted or you're locked out, stop using the machine and disconnect it from the internet. The longer it runs, the more it spreads. Then get help. Some files may be recoverable.
6. The fan runs hard while you're doing nothing
You're not doing anything demanding, but the fan is roaring and the laptop is hot. Something is working in the background. Crypto-mining malware is the usual suspect here. It quietly borrows your processor to make someone else money, and your battery and fan pay for it.
7. Friends get messages you never sent
Someone tells you they got a weird email or DM from you. Malware will happily use your accounts to spread to your contacts. If this happens, change your passwords from a different, clean device, not the infected one.
What to do if you think it's a virus
Fast version, in order.
- Disconnect from the internet. That cuts off most of what malware is trying to do.
- Don't log into banking, email, or anything sensitive on that machine.
- Don't click pop-ups, and don't call any phone number a warning screen gives you.
- Get the machine properly cleaned.
Any phone number a pop-up or warning screen tells you to call is a scam, every time. The real fix never lives inside the thing that's alarming you.
A real cleanup is more than deleting one file your antivirus flagged. It finds what's hiding, checks nothing got left behind, and closes the door the infection came in through. If you want the full picture of what that involves, we wrote up what a proper virus removal actually does.
When it's worth calling someone
If you've run a scan and the pop-ups or redirects keep coming back, the infection is deeper than the free tools reach. Same if banking or passwords might be exposed, or Windows won't start. That's the point to hand it over.
A real cleanup finds what's hiding, checks nothing got left behind, and closes the door the infection came in through.
We remove viruses, spyware, and ransomware across Calgary, in your home or remotely, and set the machine up so it doesn't happen again. If we can't clean it, you don't pay the repair fee.
See virus and malware removal for what a full cleanup covers.
