There are a few that completeley destroy your hard drive, making it necessary to buy a new computer, and give whoever sent the virus your email accounts, saved credit cards, and everything else on your computer. Magistr, Chernobyl, and kriz viruses are all very bad viruses that are definitely worth protecting yourself against. There are probably a few more like that out there but those are the only ones I know of.
The storm worm
Norton 360.
Anything you have on your computer.
As with a biological virus, a computer virus could be serious or not so serious. It depends on what the virus is designed to do, what kind of anti-virus protection and virus vulnerabilities you have, and whether you have important information on your computer.
Their are thousands made by different people i would check out these people who made the worst http://computer.howstuffworks.com/worst-computer-viruses.htm
Viruses can steal information or destroy computers. The most common virus only steals improtant information. The worst type of virus can destroy a computer, and that computer can never be used again.
I have played and finished arcuz, it will not harm your computer or give it a virus, at worst it will give your computer a hard time because of processing it, but dont worry it will in no way way harm your computer.
win32
All virus are removable if you have the right kind of software
Well, since that (Conflicker) worm did nothing and was just a lie, the worst worm ever probably will be ILOVEYOU, or loveletter.This worm has a love message (love-letter-for-you.txt.vbs), which is the virus. When opened, this virus attacks and sends a copy of itself to all your friends and contracts.I'll also like to put the virus known as Slammer next to the Loveletter worm, as it is just a powerful. Why? It infected 80,000 computer in half an hour. So it's name, Slammer, lived up to it as being the fastest virus ever.
It depends on your kind of computer i use fantage and i didnt get a virus my friend used it and got it (srry fantage :( )
Its arguable but i think its norton anti virus It's called Agobot I Think, but you can get up to six viruses in you're computer if you get that virus?