Phenom II 940
damnit, i'm jealous.
Windows7 beta.
do you have it dual booting with somthing else (ala. Vista or XP). if so, try it there to rule out the motherboard.
that said; it's likely the first documented issue with DG and Windows7, considering both Windows7 and DG are both still in beta i doubt there'll be much that can be done about this until much closer to release.
may i ask if you've tried this in SupCom (i'd really recommend trying it against SupCom or FA) or any other titles?
either way; it's still handy for GPG to be aware of.