Gone are the days of eradicating a pesky virus thats got tangled in your O/S, its all about rootkits nowadays.... I agree with viewsonic, try a ditch your windaz for all the secure things you dont want stolen and try using linux...
There are load of live distros you just plonk in you cdrom and you off... Ive used 'Ubuntu Privacy Remix' in the past, works realy well. I would post the link but i dont have 15 posts,but im sure if you search in big G youll find it....
Hope this helps..