So I've just ordered my GTX750ti. I havn't had anything other than a Radeon in my systems for years so a bit out of the loop on moving between one set of drivers and the other. Really don't want to be installing whole OS again so 'clean' isn't an option.
Presumably I'm meant to deinstall the Radeon stuff before installing the Nvidia (intend to use latest generic nvidia rather than the ones tha come with the card)
The slight fly in the ointment is that my processor is also AMD and a lot of settings seems to have become merged in the Catalyst control Centre.