Have back tracked to driver version 7.15.11.6369 (11/9/2007) before both games would show correctly. Obviously it is best to have the latest version operating on a system - is there any chance of forwarding a patch to allow this?

I still don't really understand why Legion, Chariots of War and Gates ...

Have rolled back GEFORCE driver from version 7.15.11.8122 (14/1/2009) to 7.15.11.7813 (17/9/2008) - am pretty certain that I have successfully played the game after 17/9/2008.
Even with the rolled back version I still experience the same problem.
I can still play Legion, Chariots of War and Gates of ...

I am suffering this same problem on this game and on Legion Arena (which is basically the same program).
I am operating Vista Home Premium with Intel Core 2 Duo E6600 processors, 2048 MB Corsair XMS2 800MHz RAM and 512MB GEFORCE 7900GS graphics card.
I haven't cahnged my setup since last ...