ATI's latest package requires .NET Framework 1.1

While downloading the latest drivers from ATI:

1 package
Supported on the RADEON 9500, RADEON 9600, RADEON 9700, RADEON 9800, RADEON X300, RADEON X600, or RADEON X800 Series of products.
Note you must have Microsoft’s .NET Version 1.1 Framework installed.