I installed Windows 7 Pro x64 on my PC Monday evening.
The computer is physically unchanged from when Vista Business 32bit was running on it with which it was absolutely stable.
The problem is that every 1 hour or so the system completely stops forcing me to manually reboot it. It does not give any error it just stops. No minidump is written. All diagnostics show no apparent error, the only thing Windows registers is that it was shut down incorrectly.
I updated Intel chipset drivers (This one)
, audio drivers from the Realtek homepage, ethernet drivers from the Realtek homepage and through Windows Update and installed the newest Nvidia drivers (191.07).
The problem occurs mostly during browsing but that might just be because I'm browsing most of the time. It happened both with Opera 10.01 and the newest Chrome. The problem began quite soon after installation before I had installed any software except for Opera (and maybe Acrobat Reader) and before I had updated any drivers.
I'm really out of ideas now
I read all the other threads about similar problems but none gave a solution that I haven't already tried (updating drivers).
Changing the Energy Management setting to High Performance let's the system run stable for a week now.