Scotteq,
Thanks for the advice. I've been running the 169.25WHQL drivers since they were released. My main games are Company of Heroes (and the expansion, Opposing Fronts), World in Conflict, and Crysis.
The nvlddmkm issue has raised it's ugly head intermittently since I began using this machine with Vista x64. (Note that Vista Ultimate x64 is the ONLY OS ever on this machine, so I cannot isolate the issue away from the OS. It is a variable that I have not changed, nor am I willing to swap operating systems for the sake of troubleshooting.)
The nvlddmkm problem goes away for a period of weeks, then reappears. Once it comes back, it continually comes back, even if not playing a game. In fact, I believe it will occur with no extra process going on. (By that, I mean that _I_ am not clicking, pressing, or entering anything. I defy ANYONE to accurately assess what Vista is doing with or to their system at any given moment.)
I hard reboot pushes the nvlddmkm problem away. For awhile.
The prevalence of this issue is distressing. The main thoughts seem to be hardware incompatibilities, driver issues with nvidia, Vista problems. So, other than what's in box, what's operating the box, and items used by the box, there doesn't seem to be anything else to cover!!
Cooling, voltage, etc., doesn't seem to be at fault.
Thanks anyway.