simple explanation d00d...a LOT of ppl are infected with virii and such, if for no other reason than because they are ill prepared for real life filesharing (i.e. they have no firewall and/or no active AV scanner)...

please note that even with a good wall and scanner running in the background you are still at risk..why?, because a virus/trojan/etc has to be detected by a company, then added to their list of things to block/delete...hence, there is definitely a 'window of opportunity' in which users are vulnerable to infection (been there, done that, been infected like most others...and yeah, I've had to reformat quite a few times, and in fact I as a rule reformat/reinstall 2x a year even when things are going smoothly)

now, would you pulease stop your pulish whining and go on with life?