Right Click on MyComputer icon and go to properties
Turn Off system restore
open IE and go to TOOLS OPTIONS delete temporary internet files and cookies
do a disk cleanup in your Start/accessories/system tools/ Menu
Download
VUNDO
and save it to your desktop
Double-click VundoFix.exe to run it.
Click the Scan for Vundo button.
Once it's done scanning, click the Remove Vundo button.
You will receive a prompt asking if you want to remove the files,
click YES
Once you click yes, your desktop will go blank as it starts removing
Vundo.
When completed, it will prompt that it will reboot your computer,
Click ok
run hijack this and post your log here again