wow... viruses suck... but what i do is usually load up 2 or 3 different Anti-Virus programs on my PC to make sure that most major threats are taken care of. not all AV software is created equal. also you can find help on MajorGeeks.com
once a company releases something to the public they can not tell you how you are allowed to use it. Example - an artist puts out a CD and you buy it, copy it and post it online some where. once it is in your possesion you can do with that CD what you want. same goes with DVDs games and so on...