Uh.
Happened again.
Also been getting auto hardware reset right after os logs on, on cold boot. About the time that the AV would start.
uninstalled avast and am using avira for now. Problems went away.
Don't know if you have a problem or this is circumstantial - I could buy either.....
GA-EP45-UD3P, E7200/3.6ghz, 2x2GB, MSI N465GTX-M2D1G, Hannspree 28", 650Wpsu, Win7