"system 32 Services.exe" Has Terminated Unexpectedly / PC Shutting Down?

I recently built myself a new gaming rig a couple of months back, and up until about the last week everything's been working great. I keep getting an error message that system32services.exe has been terminated (either code 203 or 204, it varies), and that the computer will shutdown in 60 seconds. Using "shutdown -a" leaves it in a near-worthless state. I'm on Roadrunner, I use eTrust ezArmor (what can I say,it's free...); I've run antivirus and anti-spyware multiple times, but obviously it's not either finding anything else, or it can't clean it.