I just did a manual installation. I found the solution on w7forums.
Originally Posted by TorrentG
Do like this then. Open device manager. Right click on one of the cards, it doesn't matter which.
Choose update driver software. Browse my computer. Let me pick from a list. Have disk. Browse.
Now navigate to C:\ATI\Support\10-10_vista32_win7_32_dd_ccc_enu\Packages\Drivers\Display\W7_INF
and double click on CL106920.inf.
Hit ok then hit next and it will install.
For those who might have the same problem as mine, just choose the CLxxxxxx one (there are two, CL and CW).