J-Mac, I know this may sound obvious, and depending on if your using ForceWare drivers or another, you have to completely remove the old drivers before installing the updated drivers. But first you have to change your graphics preference to a standard VGA driver.
At one point I had to run one of the Detonator drivers removal programs I downloaded from their website to totally remove everything from the hard drive and registry before I could install the newest drivers, which was the ForceWare drivers.
ANY and ALL existing drivers should be uninstalled and COMPLETELY removed and the system rebooted prior to updating the drivers...Booting into safe mode and remove the drivers from here is the safest and most efficient way to remove the older and or current drivers from the system.
You also may have to reinstall your monitor's specific driver...during the install of
the video card it may have been reverted to plug and play standard.
Bus speed settings between your card and BIOS and/or other settings may be different.
Your monitor refresh rate may be too low or too high
Go to the website of the manufacturer of your motherboard to download and install the latest MiniPort Drivers (if needed) - this one usually corrects a lot of issues.
If you have a USB mouse that can be moved to PS/2, try using the PS/2 port instead. It may fix the problem without having to perform any of the above solutions.
Only as a LAST resort try updating your system BIOS.
All else fails try using a past version of the drivers. The newer version may be causing a conflict within the system.
A Fresh install of Windows usually correct all issues...especially issues regarding older video drivers that cannot be removed from the registry. This is one of the BIGGEST causes for the
video card to fail. Make sure you back up ANY and ALL important files that are on your system to another storage device.
Some sound cards have to be removed (Sound Blaster Live for instance) from the motherboard and reinstalled after installing the graphics card. Reason is that it consumes too much of the system resources and does not like to share them.
Even updating your sound card drivers could cure the problem.
With Winblows, there's just too many variables that can cause these type problems....
My old computer I built myself. I inherited the present HP mochine then maxed it out, and once it's obsolete I'm ripping the gut's out of my old non-proprietary puter and building it with the latest fancies. I may or may not be using Winblows when that happens. Depends on where MicoSux goes with the new OS. I won't touch Vista........