It looks like you've picked up a well known virus. Go to Norbie's site & register & follow his directions carefully. He will be able to fix your problem for you; he is an expert!
NorbiesWorld (click on link)
In future, ignore all files less than 2,000 KB (2 MB) as most of those are spam or virus spam.
WARNING: Viruses on network you should be aware of! (click on link)