Error when installing Mountain Lion.  I'm stuck...

I'm trying to install Mountain Lion to my iMac.  After getting the instalation under way I returned to see an error.  I tried to reinstall in and had no joy.  I read a few things on the discussions and so have tried to repair my disk in DU - after verryify disk the repair option is greyed out.  I've tried to erase my disk and start over, but I can't get it to 'unmount'.  I've tried to restore from my time machine but get an error message about volume's being used.  I've read the info in the little operations manual about repairing, restoring and reinstalling and tried that. Nothing.
I'm stuck.
Any ideas?
Thanks very much.

This says Snow Leopard, but it applies to Lion as well.
From Kappy
Install Mountain Lion Successfully from 10.6.8

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