PC becomes unusebale over night.

Ive been running W7 for a few months now and other than a few problems im very happy with it.
Since 7067 and 7077 (clean instals of both) and now 7100 (upgraded from 7077 but with no side affects yet) i find that if i leave my PC on over night in the morning all i can do is move the mouse, everything esle has frozen. The only thing i can do is to re boot via the button on the PC.
Ive tried various power settings but cant figure this out.
My Asus Mobo seems to have all the correct drivers (all from W7) and i dont have this trouble with XP on another HDD.

Any ideas?

Thanks.

I had this issue once. In the morning.
The PC would freeze on start-up and the thing that moves is the mouse pointer. I tried turning it off and on again and again using power button and it stayed frozen.

Try going into Safe-Mode and restart again back into normal mode. (It may help or not but I think this problem happens randomly :S)

I'm sure it's another bug that should be fixed in updates to the RC or the Final Release.

I'm running Build 7022 right now, and I haven't had any problems leaving it on all night.

Are you running Aero?

Thanks guys.
Yes, im running aero.
its not random, it happens every time i leave the PC on over night and i have to give it a cold restart. After that it all runs fine, no need for safe mode.
Im pretty sure its to do with power management but cant figure out whats going on.