I recently updated from Catalyst 12.2 to 12.3. I found that I can no longer play Portal 2 without crashing at startup. After reading some threads, I found the answer was to roll back to the previous driver.
So... I uninstalled the existing driver, ran Driver Sweeper from safe mode, and re-installed the 12.2 driver. When I went to the CC to check the version, it was 12.3! I did the above procedure twice just in case I goofed up, but it still updates itself to 12.3. Yes, I unchecked the update checkbox.
Finally, I uninstalled the AMD Catalyst/driver/CC etc. and let Windows Update download an AMD driver. Now I'm using ver. 11.5, but Portal plays just fine. Is there any way I can install a Catalyst driver that's a bit newer without it automatically updating itself to version 12.3?
Windows 7 x56 Intel C2Q Q9550 HIS HD 6850 Gigabyte GA-EP35-DS3L 2x4GB 800MHZ DDR2