Try a beta bios. I think the newest is 1.86 or something like that. I don't know what is in the changelogs for the betas so they might not apply to you. If the ati hotfix doesn't work you could always try a clean install of windows.
however, i'm planning on having a clean install soon, since i'm changing my 60gb ssd to a 120 gb, so i hope at least that will do.