my suggestion is to go get windows anti-spyware program. Its a beta edition free on their web site, here is a url to get to the download site. It really helped me when i had this problem.
http://www.microsoft.com/downloads/d...displaylang=en
another thing you could try would be a windows system restore. double click system icon inside the control panel to open the window with this option. There is a tag for restore.