I just installed Windows 7 RC, and can only assume it works in the RTM (it does).
-First, download the drivers for the 9200se (these will be the xp drivers).
-Second, extract the package (this is basically running the .exe you just downloaded). The package will extract in an ATI folder on your C: drive. It will then try installing the driver, at which point it should fail. If it doesn't fail, cancel it, all we want is the extracted folder.
-Third, go to your device manager (in control panel) and open up the display adapter tree. Right click on the "standard VGA adapter" and click "update driver software."
-Fourth, click on "browse my computer for driver software" and paste ... C:\ATI\SUPPORT\6-11-PRE-R300_XP-2K_DD_CCC_WDM_38185\DRIVER ... in the field to search for. Otherwise you can just click "browse" and go to that folder.
-Fifth, click "next" let it install, and restart. After you boot back up you should have the drivers installed.
Now, just keep in mind these are old drivers, 5/3/2006. I also did not notice a gain in performance after installing these drivers. I had a 1.0/1.0 score for my graphics subsection on the Windows Performance Rating, and a small increase of 1.9/1.0 after installing these drivers. But, if some of you need this driver update to get better resolution, this should do the trick. No Aero obviously... Good luck!