Fixed the problem. Seems there was a bunch of stuff from a demo install and a dom folder from an old install full of strangely named folders.
Deleted everything, reinstalled, re-entered cd key and all seems good. Also discovered my son decorated my manual with some lovely red crayon on several pages
His older brother did the same to most of my D&D books a few years back.... must invest in bookshelf/cabinet with lock
PS How much does CB mod change? Would I be confusing myself reading through the manual to catch up? It has been a long while since I last played and am definitely rusty.