Update: I just uninstalled 9.2 and installed 9.3 and OpenGL works without any issues The atioglxx.dll version from 9.3 is 188.8.131.5243. The atioglxx.dll version from 8.9 is 184.108.40.20676. http://game.amd.com/us-en/drivers_catalyst.aspx __________________ I know some of you still play your old school OpenGL games such as Quake 3, Doom 3 and Unreal Tournament. The problem is that using the latest ATi Catalyst 9.2 driver (and earlier) for Vista x64 (works fine on Windows 7 x64 except OpenGL) causes these games to flicker continuously, rendering the game unplayable. I've tried installing the 8.12 preview driver for Windows 7 but that doesn't work either. Searching the interwebs seem to point ATi video card owners to install the ATi Catalyst 8.9 driver for Vista x64. Well, instead of uninstalling the whole 9.2 package to install ancient 8.9, why not just extract the 8.9 OpenGL driver and use it on the 9.2? The advantage is that you still use the latest D3D drivers for newer games. Assumptions: -using Windows 7 Beta 64-bit -using ATi based video card -using ATi Catalyst 9.2 or earlier Instructions: 1. Search for "8.9 Catalyst x64 Vista" and download that package 2. Use 7-Zip to extract the files inside the package exe 3. Inside the extracted files, search and copy the two files below atioglxx.dl_ (about 4MB) atioglxx.xml (very small size) 4. For the tutorials sake, paste the two files in the root of your C:\ 5. Start command prompt, go to C: then type "expand atioglxx.dl_ atioglxx.dll" (you will notice the dll file is now about 9MB) 8. Go to C:\Windows then search for the dll and xml files one-by-one using the top right search box 9. Go to each of the folders that contain the dll and xml files, take ownership and overwrite them 10. Start your favorite old school OpenGL game in full screen without flicker! This works for UT99 using the latest OpenGL driver.