Hello and welcome to the windows7forums,
We need to know the exact make and mode of your video card.
Also,have you checked out HP's site for Windows 7 drivers?
Please fill in your computer specs by clicking on the Settings link at the top of the page.
This helps greatly with trouble-shooting your problem.
You can get this detailed information by downloading
SIW (System Info) 2009.10.22 and going through the various pages