Dave,
Since Vegas Pro's Trial version was putting that logo bug on my video, I went back to Vegas Movie Studio 10. I installed on D drive, one of the SATA drives. C is the SSD. Well, Vegas was still storing the temp files on C drive, which I fixed. Then I turned off Data Access Protection (control panel, advanced system, performance) for Vegas. I rendered a 15-minute segment and it was fine. I am now 40 minutes into a 60-minute segment render and so far so good. I think you hit the nail on the head. The 8 CPU's are at 60% only. Hopefully this will fix it. I'll have them install a bigger SSD for C drive. I really appreciate the help, and will holler if anything else comes up.