Try installing this driver HERE
(directly from ATI). You can download either the catalyst control center or just the graphic drivers. If you download the catalyst control center, read the next paragraph before installing. Also, take a few minutes to read the installation instructions.
The only time that I've ever had troubles with my old 9600pro (which now runs like new in my sons machine) was when I didn't have microsoft's .net frame work installed (which is required by the catalyst control center). You have to have the .net framework installed before installing the catalyst control center (install then restart). Read about it and follow the link HERE
Install the .net framework then restart. Then, install the catalyst control center and restart. If it won't work try installing just the graphic drivers.
If none of this works, post back and let us know and we'll help you more! I've owned the 9600 pro for quite a while, and installing the .net framework has solved the only issues that I've had with installation problems! Hope it works for you!
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