Thank you for contacting AMD
I understand that you are unable to play some games with Catalyst 12.3. Even after reverting back to 12.2 you are still getting the same issues. After installing 12.4 the system still states that you are on 12.3. If I have missed any critical information please let me know as my suggestions may change.
I would advise to go back to 12.2 where all the games were working fine. I know you reverted back to 12.2 but the same problem occurred as 12.3. The most common reason why the games don’t work on 12.2 anymore is because when you reverted back the ruminants of Catalyst 12.3 is still in the system which is causing errors.
I am attaching a guide that will fully remove the Catalyst from the system. Please follow it closely as it leads into the Windows Registry. The guide only mentions to delete ATI folders but you should delete any AMD folders that you see.
After a restart of the machine from completing the guide download the 12.2 Catalyst and install it. This should address the issue that you are having. I’d advise to stay on 12.2 unless it is required to go with a higher Catalyst version for example a game requires that specific driver.
http://support.amd.com/us/gpudownload/windows/previous/Pages/radeonaiw_vista64.aspx
I believe the information provided above will resolve your issue regarding unplayable games. If we do not hear otherwise, we will assume that the issue has been resolved and the service request will be permanently closed after 10 days. If more time is needed to evaluate my suggestion please let me know and I will ensure this service request remains open for you.
In order to update this service request, please respond, leaving the service request reference intact.
Best regards,
AMD Global Customer Care.