First download this:
Clicky
Then download whatever Catalyst version you want from the following link or directly from ATI's site.
Clicky (ATI)
Clicky (Driver heaven.net The download may be a little slow, but it will finish.)
Once you get the drivers downloaded, click on the self installer so it can start to decompress them. It will try to install the drivers, but it will fail since it can't find your hardware (it's normal for that to happen). Once the drivers are extracted, run the modding file. Select the directory where the drivers decompressed and it will modify all the required files. After that just start the install process and everything will install normally. Tada!
