Can't you use the Vista theme, without the Aero transparancy?
Man that is weird... Try setting it back to Aero now, and see what happens...
hmmm could do but they would just say its a graphics driver issue wouldnt theyWhen you say Aero, you mean the glass effect?
Can't you turn that off and just have the Vista theme, Bummer!
Try what Rambo said and try it in Aero now.
EDIT: You beat me, Strange that it doesn't work, try Emailing Microsoft?
Nice one dude!