Well, that's odd. here's what I would try:
1. Get the Catalyst Uninstaller from ATi.
2. Get the 6.2 drivers released by ATi yesterday.
3. Get the Microsoft
.NET Framewrok from Microsoft.
4. Save all of these to your Desktop.
5. Stop doing anything important. No really, save your work and close everything.
6. Run the Catalyst Uninstaller program.
7. You will probably need to restart the machine.
8. Let Windows detect and install it's own driver for the display.
9. You may have to restart again.
10. Install the .NET framewrok.
11. You may have to restart the computer.
12. Install the Catalyst 6.2 drivers.
13. Restart the computer again- even if you are not prompted to.
14. Start the game.
To get the Catalsyt uninstaller, look under the NOTES section above the driver download on ATi's website. It's on the actual page you would download the drivers from.