A further development...
I ran RegEdit and searched for VirtualRPC. I found about 5 entries. Although I looked at the contents (right click and choose Modify... then Cancel), nothing was changed.
Lo and behold, when I idly clicked on the task bar icon for VRPC, the damn thing ran without a murmur! Inanimate machine 1, human being 0.
The only problem was that the resolution was 3840??1080 and the display was almost unreadable when confined to just the one monitor. Blind (almost) fiddling with the Display menu eventually got me back to 1920??1080 and I was able to change the setting in Configure.
All I have to do now is strip the machine down and reinstall the graphics card and get it to treat the two monitors as one.
This is unsatisfactory, in a way, because I still don't know what caused the problem. However, I have a solution which is a great relief.
John _________________ John McCartney
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