nbrt won't finish scan

I have a Dell XPS Studio running 64 Bit Windows 7 pro.   I burned NBRT to a DVD.  It scans about 100,000 files and then the screen goes blank, the fan speeds up and I can't operate the computer.  I have to do a hard reset and reboot to get it back.  Also there is no log created that I can find.

 

Any suggestions would be appreciated.

 

 

Thanks.