Trying to disable a Hewlett Packard service in Msconfig, I noticed another startup item, NvCpl.
I googled it and its apparently a process registered to the W32.SpyBot.S Worm and causes shutdown by overflow. It was listed as both a virus and a trojan.
However, Trojanhunter didn't find it, or anything else for that matter, and I haven't experienced any shutdowns I didn't initiate.
McAfee also just popped up with Malformed Archive, but that's a problem for another thread.
Thanks in advance