Antivirus2008 Pro is a rogue program !!!
This will take more than just an uninstall to clean your machine of this rogue piece of software.
I strongly suggest you get expert advice on removal and cleanup.
Download Hijacktis to your desktop click here
Run the scan and post the log at MWR click here
You need to register and please be paitent the experts will get to you.
Do NOT tinker with the results of the HJT scan,you can/could render your computer unbootable.