Odd BSOD -- overheating?

Okay -- I'll explain this.

I was playing a game, CivCity Rome, on medium graphic setting. Which I never had trouble with before. Then partway through the game, the menu/interface started flickering on and off, and the background of the menu was "transparent," you could only see the buttons.

I had barely got it saved when I got a blue screen then it rebooted. Didn't get a chance to see what it said. After some struggling with the Vista UAC, I got the crash dump open, saying the suspected cause was nvlddmkm.sys, which I believe is the NVIDIA driver.

However -- this is the odd part -- it's been really humid and warm around lately, so I actually believe it may have been slight overheating.

Should also mention I recently installed VirtualBox, which installed some drivers, but I doubt that's it.

What do you all think?

 

I've tried Everest and it couldn't detect my hardware, but SpeedFan says it's around 66 C normally, which is supposed to be a normal temp for my card (NVIDIA GeForce 8400 GS). Currently aroujnd 64 C, weird, guess turning on all the fans in the room did help.
Have the latest drivers. I'll try the 3D settings thing, although it's the first time I've seen it happen.

 

Well, the computer rebooted so fast I didn't get a chance to grab it. Can't quite remember how to make it not reboot.

 

More information! From WhoCrashed:

 

Did some clocking. GPU came in as 69 C while gaming. Regular's 66, so doubt its overheating.

 

run Furmark I find it pushes your GPU to the limits (it pushed my 9800GX2 to such a high temp i could almost boil water on it) ... Run it, set it on stability test mode and watch its temp (it has an inbuilt temp graph). Let us know then ... as Halo said update drivers to latest ... and ... for Auto reboot, in Vista, right click on My Computer, select Properties, select Advanced System Settings, in the Startup and Recovery area click Settings, untick Auto restart, tick write an event to system log.