No m-audio interface in current engine (playback engine)

[SlicerSounds]

Hi - my first ever post so hopefully it will be successful. I downloaded the fender ASIO 2 driver (for fender mustang III amp) and, ever since, PT periodically decides to use that as my playback engine. Not a problem to date as I've merely changed back to my fast track pro in the current engine drop down menu in the playback engine window. However, now there is no drop down menu (only the fender ASIO shown) and thus I can't select my fast track pro. I've tried updating the drivers and uninstalling the fender ASIO driver (not great as PT wouldn't even let me in so had to reinstall it). This is now driving me mad as I can't do anything in PT. Any ideas!!