I would be concerned that this virus re-appeared so soon after you re-installed windoze. It normally takes some time for such a virus to find an infectable machine and infect same. Is there a possiblity that one of the programmes that you have downloaded is infected? Also, you don't say what form of virus protection you are using. If you haven't got one working - which should be the first job after windoze has been re-installed the recommended free one here is Avast. You never know where viruses are going to come from these days. Our local super-luxury hotel website became infected a few months ago. I e-mailed the management and they got it fixed PDQ. Two weeks later the infection returned! I think that they have got it permanently fixed now.
P.P.