8.8 works fine for me.
OK, here's what you're going to do:
First of all, download Driver Sweeper
, you'll need it later.
Go to control panel/add-remove programs -> ATi display drivers - uninstall. You will be prompted to reboot, do so. -> Reboot into safe mode by tapping F8 just before Windows begins to load. When you're at your desktop and in safe mode, run Driver Sweeper. Check the "ATi - Display" checkbox, click analyse, then clean. Reboot once more (not in safe mode). Install the 8.9 BETA drivers: http://forums.techpowerup.com/showthread.php?p=962830
-> You will unfortunately once again have to reboot, but it will all be worth it because your games should work fine.