ATI currently recommends installing this drivers set over the official 4.11 if you intend to play the recently released Half-Life 2 game. The information in this article applies to the following configurations:
RADEON 9500 or Higher
PunkBuster Online Gaming Servers
Windows XP, Windows 2000
Random hanging has been observed with certain games on certain systems when using the PunkBuster server.
Note: If you have Catalyst Control Center previously installed, you will need to reinstall it . You may download Catalyst Control Center if required.
Here's other similar drivers that are different versions or releases for different operating systems: