You can see by yourself what is happening, copy the log here:
www.hijackthis.de and click on Analyze.....
Some tools that you can also use:
Ad Aware:
http://www.lavasoftusa.com/ download, install, update and scan the computer.
CW Shredder:
http://www.intermute.com/spysubtract..._download.html download, install and scan the computer with it.
Any online anti virus scan
Before doing that, disable System Restore so that it won't be back.
