Greetings and thanks again for your thoughts.
Well - I tried it and it would not take a fresh install from the CD. The only thing I did not use was the Installer Cleanup util as there was a suggestion that it should not be used for MSOff 2007. As to why, that's anyone's guess.
So - for the 3rd time - I have formatted and reloaded the original factory image and - yes you guessed it - it still behaves as it used to, i.e. throwing up the Installation/Configuration screens as before.
Yes - I saw that V 4.0 was not available - but your news about 4.5 and the Service Pack brings hope!!!!
It's either that - or we go back to XP
Again - many thanks.