What is the worst computer virus you go while surfing the web?

I got raila odinga one time and no antivirus could take care of it so i had to kill it manually. I also got ashan you know the one that changes your recycle bin to G.W Bush.Im thinking that was from a programmer in the middle east. I took care of it manually too. now good antivirus are in the market like kaspersky but then when they could not take care of them i have to say it was really though. Thank GOD for my knowledge of how to kill them without a antivirus.lol

the trojan the worst virus i come across. It is of different varieties. It can affect the computer in many ways.

Yes. You have to reformat your computer.

One virus damage my file system, other virus damage my all EXE files. I repaired computer from this virus which shut down it, but i don`t remember how.