If your computer is hacked, you might notice some of the following symptoms: Frequent pop-up windows, especially the ones that encourage you to visit unusual sites, or download antivirus or other software. ... Frequent crashes or unusually slow computer performance. Unknown programs that startup when you start your ...

Can a hacker access my computer?

These online villains typically use phishing scams, spam email or instant messages and bogus websites to deliver dangerous malware to your computer and compromise your computer security. Computer hackers can also try to access your computer and private information directly if you are not protected by a firewall.

How did my computer get hacked?

Hijacking ads - Cybercriminals often place ads containing malicious code on legitimate websites. They do this either by purchasing ads directly, hijacking the ad server or hacking someone else's ad account. Malware sold as legitimate software - Fake antivirus programs have infected millions of computers.