Unplug your computer from the network, bring in an AntiVirus like ClamWin or AVG on a CD, plug back in and quickly update the AV's, reboot into safe mode (F8 at boot) and scan. Here is a doc to help out:

http://www.antionline.com/attachment...achmentid=4913

When you are done, update windows from Internet Explorer. Go to tools and select windows update, it is very important that you do this.