Nobody expects their computer to get infected — but it happens to careful people all the time. The good news is that most viruses and malware leave behind clear warning signs. The sooner you catch them, the easier the cleanup.
Here are five things to watch for.
1. Your Computer Is Suddenly Much Slower
If your PC used to start up in 30 seconds and now takes three minutes, something changed. Malware often runs quietly in the background, using your processor and memory for its own purposes — whether that's mining cryptocurrency, sending spam, or waiting for instructions from a hacker.
A one-time slowdown isn't necessarily a red flag. But if things have been noticeably sluggish for days or weeks, it's worth investigating.
2. You're Seeing Pop-Ups You've Never Seen Before
Legitimate software doesn't throw unexpected pop-up windows at you. If you're seeing alerts warning you that your computer is infected (especially ones that look slightly "off"), offers to win prizes, or anything asking you to call a phone number — stop. Don't click anything. These are almost always scams.
Important: Microsoft, Apple, and your antivirus software will never ask you to call a phone number through a pop-up on your screen.
3. Your Browser Looks Different
Did your homepage change without you doing anything? Is there a new toolbar you don't recognize? Are your searches being redirected to a different search engine?
Browser hijackers are a common type of malware that silently changes your browser settings. They're usually installed alongside something else you downloaded — a free program, a PDF reader, a game.
4. Programs Are Opening or Closing On Their Own
If your computer seems to have a mind of its own — programs launching, mouse moving, or files appearing that you didn't create — take it seriously. Remote access trojans (RATs) allow attackers to control your computer as if they were sitting at your keyboard.
If you ever see your cursor moving on its own, disconnect from the internet immediately and call for help.
5. Your Friends Are Getting Weird Emails or Messages From You
Malware doesn't always stay on your device. Some viruses access your email or social accounts and send messages to your contacts — usually containing links to spread the infection further. If someone texts you asking "Did you send me this?", your computer (or account) may be compromised.
What to Do If You Notice These Signs
- Don't panic — most infections are fixable.
- Disconnect from WiFi if you think something is actively happening.
- Don't log into any accounts (banking, email) until the issue is resolved.
- Call a professional — running the wrong removal tool can sometimes make things worse.
We handle virus and malware removal all the time. If something feels off, reach out and we'll take a look together.