5 Signs Your Computer Has Been Hacked (And What to Do)
Published: December 12, 2025
Hackers are getting sneakier. Gone are the days of giant skull-and-crossbones appearing on your screen. Modern malware prefers to run silently in the background, stealing your data without you noticing. Here are 5 subtle signs you might be compromised.
1. Sudden Slowness
If your fast computer suddenly feels like it's wading through molasses, it might be running a hidden cryptominer. Hackers use your CPU power to mine cryptocurrency, leaving you with a slow PC and a high electricity bill.
2. The Fan is Always Running
Is your laptop fan spinning at max speed even when you're just reading a text document? This indicates high processor usage, a common sign of background malware activity.
3. Strange Browser Pop-ups
Toolbars you didn't install? Search engine changed to something weird? Frequent redirects to gambling or "adult" sites? This is a classic sign of Adware infection.
4. Disabled Antivirus
Smart malware will often try to disable your security software first. If you try to open your antivirus and it won't launch, or says "Protection Disabled" and won't re-enable, you have a serious problem.
5. Friends Receiving Weird Emails From You
If your contacts ask why you sent them a weird link, your email account has likely been compromised or "spoofed."
What To Do?
If you notice these signs, disconnect from the internet immediately to stop the data theft. Then, boot into Safe Mode and run a full system scan with a reputable tool like Malwarebytes or Norton.