From a guy who clicked on a pic from a Google image search, Saturday and then spent the entire day and part of Sunday eliminating "about:blank" and two trojans that somehow waltzed right thru MS Firewall, Norton Internet Security, MS Spy Blocker and a router, trying to locate passwords, access my bank and send emails to my friends, I say; allow me to mete out the justice. A little islamic stoning party might just fit.
I HATE when that happens! Especially in a corporate environment. Spyware- and virus-mongers should be put on the chain gang - digging ditches in southern Mississippi. In summer.
Micro$oft's firewall is crap. I installed XP SP2 the last time I reformatted, and I didn't really care for the firewall portion. You can't even use it to block individual ports! (Or at least no way that I could find.)
So I disabled that sucker and installed Zone Alarm Pro. It's more customizable and easier to configure. MUCH tighter program access control.
If some nasty bit of code somehow found its way into my machine, ZA would immediately let me know something hinkey was going on and where it was coming from. After that, it's just a matter of hunting down the wee beastie and killing it.
You might want to look into customizing the security settings on your router, if you haven't already.