Let me start by apologizing if this is posted in the wrong category/section.
My pc has a Biostar TH67B motherboard, i5 2400 cpu, 4 gigs 10600 ram @ 9-9-9-24, win 7 x64, gt 520 vid card, 480 watts.
It's been running fine, temps are well within acceptable range, etc. But recently it has started to shut itself down. Not just an immediate power down, but to calmly shut down programs, and even post that fade-to-black screen that lists the programs still waiting to shut down. I hit cancel, and go on as I thought it a fluke or glitch at first, but it's happen a few times now, and so I'm starting to worry. I've not found a virus on it either.
I checked the even logs though I'm not sure what to look for there, and all I could find was:
The attempt by user Astor-PC\Astor to restart/shutdown computer ASTOR-PC failed
Check Windows Update, it might be in automatic mode, which will cause reboots after updates are installed. Set it for download then ask me to install (or something like that, I believe it is the second choice).