5 Signs Your Computer Has a Virus (And What to Do About It)

If your PC has been running slower than usual, showing unexpected pop-ups, or behaving strangely, it might be infected. Here are the five most common signs of a virus — and exactly what to do if you spot them.

1. Sudden Slowdowns

Malware runs in the background consuming CPU and RAM. If your machine crawls without explanation, open Task Manager (Ctrl+Shift+Esc) and look for unfamiliar processes hogging resources — then run a scan.

2. Unexpected Pop-Ups

Adware and spyware flood your screen with ads, even on your desktop. Legitimate software never does this. If you’re seeing pop-ups outside your browser, something is wrong.

3. Programs Opening or Closing on Their Own

A hijacked system can be remotely controlled. If apps launch without you touching anything, disconnect from the internet immediately and do not enter any passwords.

4. Your Antivirus Is Disabled

Sophisticated malware often kills your security software first. If Windows Defender or your antivirus is suddenly turned “off” and you didn’t do it, treat it as a serious red flag.

5. Unknown Programs in Your Startup List

Press Ctrl+Shift+Esc, click the Startup tab, and look at what launches when your PC boots. Anything unfamiliar with high impact that you didn’t install is suspicious and should be investigated.

What To Do

Disconnect from Wi-Fi, boot into Safe Mode, and run Malwarebytes (free). If the problem persists or you’re not sure what you’re looking at, contact Rexxers Support — we’ll clean it up remotely and make sure your system is secure. Start with a free consultation — email [email protected] or call (818) 305-5806.