Radeon HD Mobility 5650 No Longer Compatible?

I was playing the Beta flawlessly prior to Beta Patch 5. I'm running Windows 7 x64, with a Radeon HD Mobility 5650 on a Sony Vaio. The drivers claim to be up-to-date; however, it seems ATI released a driver update package on their Support site on Halloween. For WHATEVER reason, even though my computer is not even a year old, they decided that my video card is not "included" in their driver update.

Now, it seems I have to buy an entirely new computer, when the one I have now could run Diablo III perfectly. Unless, of course, this is a bug.

EDIT: Wrong forum.