Hi, have you tried Windows Update?
I take it the HP Drivers were the first ones you tried.........
http://h10025.www1.hp.com/ewfrf/wc/s...os=228&lang=fi
Download them again if you need to.
Then, uninstall the nvidia drivers from Add/Remove Programs and uninstall your video card from Device Manager by right-clicking and selecting uninstall.
Restart; but repeatedly press F8, until you get the alternative startup options, like Safe Mode etc.
Choose to start in VGA Mode.
Disable any non-operating system programs that are running, e.g. Anti-Virus etc.
Run the driver install application and restart.
Adjust your Advanced Display Settings and restart again.
(apologies if you've already done all of this)