I have just had a very very nasty piece of spyware on my home PC called virus heat. Virus Heat is a new rogue anti-spyware program. Instead of clearing up spyware, it generates annoying popups and slows down your computer. You get an icon in the task tray at the bottom of your screen that looks just like an official windows icon which tells you your computer is infected - you click it and an advert pops up and you just can't get rid of it! It has been a nightmare to get rid of and has taken me hours. It slowed my computer down to almost unuseable. Because it's so new my anti-virus let it in. Eventually by surfing geek sites I found a free/donation based program called superantispyware that killed it but I was amazed at lots of other stuff it picked up as well. May be worth scanning your PC's with something just in case!