Ok, I'm running on AGP's 6800GT.
The 81.85 did give me some issues (even though I was using a mod 81.85 then).
Game play will slow down quite badly after a while. My Optical mouse would freeze too at times. Desktoping is slower too. The only recovery is, REBOOT! But, then those problem kept coming back!
So, I switched back to previous WHQL of mod 78.05, all the above-mentioned issues are gone forever and my desktoping is back to normal and very responsive now.
Yes, I think 81.85 does has some issues with "some" 6800GT.
I'm sticking to 78.05 at the moment. Afterall, 78.05 does performs very well already in terms of IQ and frames!