I've got an Acer Travelmate C302 tablet pc with the same video hardware in it. I've spent the last 3 days trying anything and everything to get the video drivers installed. I got everything else working under windows 7, but just couldn't get the video drivers to work. It would always revert back to the standard vga drivers, which weren't bad, but didn't support screen rotation.
I even managed to get it so it didn't uninstall the drivers at one point, but the drivers would always fail and windows would shift down to a 256 color screen, which looked horrible.
So I finally gave up and reverted back to vista, which actually works pretty good on my slightly upgraded tablet. (faster cpu, faster hard drive, 2gb ram).