I'm running the Windows 7 beta on an Inspiron 6400, and I figured I might as well try the 64-bit version. But nowhere can I find a 64-bit driver/s for any of ATI's Mobility Radeon series. ATI's site says to check the manufacturer's, but Dell's gives no hint as to what to do for 64-bit drivers. Most things are installed fine with generic drivers, but this is one of very few things which is not.

Does anybody know where to get this driver? Or should I contact Dell directly? Or is it simply not publicly available, even for something Vista-compatible?