Well, you are not alone....
I also have the identical problem that you are experiencing (pun: windows
experience rating). I am using 2 ati 2900xt GPU's in crossfire mode, and for
all the money I spent on this system (Intel QX9650 Extreme, 2 gig DDR3 10666
memory, ASUS Maximus Extreme motherboard, 1TB HD, and 1 160GB, 10,000 RPM HD)
I would like to thing that this friggin rating thing would give me more than
1.0. And yes, like you it keeps telling me that it's still unrated and needs
to be refreshed. My graphics, and my gaming graphics rating is 1.0 and
everything else 5.9. Now I know why my kids tell me to give it up and buy a
PS3!