The one that renders all your files useless. I got it in early January, something popped up saying I should run a scan with a program, I did it, then I got a virus from it. While having that virus your information is free for everyone to see. Good thing I have recovery disks.
Technically the worst computer virus of all time was the "ILOVEYOU" virus back in 200. It spread through e-mails, chat rooms, etc.... It would overwrite executable files, conceal itself in pictures and overall completely obliterate your computer's memory. It did millions, maybe billions of dollars in damage and made #1 most deadly virus of all time. Luckily I know all about computer viruses so i'm practically an expert in this subject. It also featured in the game "Hacker VS Hacker" and that game is playable on Armor Games. None of this information was copied from another website.
I think the worst one would be a keylogger because that takes every thing you've typed in and sends it to the person that logged your computer. So if you typed in any personal information such as your credit card or w/e your basically screwed
i dont know if my question is off topic but is there a virus mix with the abilitys of a worm, a trojan horse and a keylogger? that would be worse. i had never a worm or a trojan, so i cant say whats worser, but i think a hacker that controll your computer and/or destroy it is the worst.