I had trouble playing games and it was because the chipset drivers needed updating. One of the chips is for video the other for sound. Updating will install both drivers but you may need to uninstall the original drivers first via Add/Remove
1. First uninstall any drivers and software using add/remove programms in control panel that relate to the ATI card.
2. Uninstall the drivers for the card, this can be done by going into device manager from control panel-system - advanced. Here you will see the display adapter, delete it.
4. Reboot your PC and if windows starts to load any drivers, cancel it. Windows will load a generic VGA driver and the screen may not be very good, this is temporary.
5. Insert the disk which came with the card, if you do not have this you will need to download the drivers from ATI, you will need the win xp drivers for your card and always choose the latest ones. Download these to a folder, you can make one on your desktop and call it 'ATI'.
6. Either load the drivers from any disk you have for the card, or double click the downloaded ones. This will then install the drivers.
7. Reboot the PC and windows will use the drivers you have reinstalled.
If all goes well you have fixed it, if not on ATI website you will find a Driver Removal Tool. Download this and run it.