Viruses, Worms, Trojans

[peanut]

Say you have a trojan, worm, or virus that a program like Avast finds on your computer. Everyone knows that these malicious programs dont always stay in one place. My question is when the nasty is found, and it is removed, do all the remnants of the program that have spread into other files get removed too? If not, can they still do damage since part of the program has been removed? Thank You.

[Garamond]

I'd say that so long as you use a good antivirus program it should delete the virus wherever it happens to be in whatever quantity. It'd be pretty pointless having it otherwise.