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Originally Posted by Richy99
sounds like you have remains of the ati drivers on the system, try and clear it off, there are tools out there that should remove all remnants of the ati software, most people format and reinstall on such a major hardware change
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Indeed; ATI do their own, very effective driver cleaner; it's called
cat-uninstaller.exe and you can get it from the Utilities section of their driver pages. It's also uncluded in ATI's more recent display drivers sets (i.e. the downloads including display driver, capture driver and Control Panel/Center) - you find it as ATI - Software Uninstall Utility in Add/Remove Programs when you've installed the driver set.
Uninstall your NVidia drivers (the cat-uninstaller shouldn't remove anything from them, but best to be sure), reboot, run the file and reboot as required. Run your Driver Cleaner again, just to be sure, and make sure you remove program starting references as well as other registry entries. Then delete (if you haven't already) the ATI folder on your C: drive and any ATI folders in Program Files. Do a search in your Windows folder for ati*.* and delete the lot. Then empty the Recycle Bin and reboot.
It may also be worthwhile reinstalling your chipset drivers and your installation of DirectX. Reboot again and reinstall your NVidia drivers.
This process should remove any ATI remnants from your system (as you probably know, both ATI's and NVidia's uninstalls are woefully inadequate) and make sure that any possible damage to your chipset drivers and DirectX installation are repaired. HTH