This time the clock did reset - I can see the system time in the Windows XP settings..
Alas there is still no way to change the BIOS settings because I can't see what is going on.
Effectively I have bricked the board.
I might mention that the board and drivers are not compatible - I get crashes with the video drivers for 64-bit Win 7.
The only recourse was to enter safe mode and remove the Intel HD drivers.
Windows XP video drivers seem to work OK but the sound drivers are erratic. (System sounds do work but not Netflix soundtracks)