Hotfix available, too
I upgraded Vista Ultimate yesterday to Windows 7 Ultimate. It rocks! Small problem, though. My Catalyst had to be uninstalled prior to, and didn't want to reinstall afterward, correctly. Dell was of no help as I have a 6 month old loaded Studio 1535, which wasn't eligible for the free Win 7 upgrade. Little did I know, even thought the Microsoft advisor said OK, Dell wasn't and no where did I find that on their website. After an extensive and frustrating chat with a Dell service tech, I found the hotfix myself on the ATI website. It is not on the Radeon 3400 series driver update page. I found it by Googling. I uninstalled the driver, reinstalled, then applied the hotfix. Perfect!