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Thanks. I had already tried all of that. The problem seemed to get worse since posting the above and led to BSOD and restarts. During the last crash there was a message about not being able to start Windows and then a repair (not restore) was performed by Windows. After that I did a Windows repair from the installation disk. So far that seemed to have fixed the problem (a corrupt system file?).

Once in a while the screen suddenly becomes a series of closely spaced horizontal lines and the computer is frozen. Need to reboot at that point. Operating system:Windows 7 Home Premium (64 bit) Service Pack 1 System root: C:Windows Available physical memory: 6135 MB CPU: Intel® Core i7 CPU 920 @ 2.67GHz Drive Info: C: 250.00 GB D: 250.00 GB R: 448.59 GB S: 448.60 GB Internet Explorer: 11.0