Mashine 3 crash while updating the Library

So I was web browsing while waiting for the rescan of the Library, when the PC suddenly crashed. All my Library was on an external usb 3 HD and thats fine and still all loads up ok into Mashine on the pc. But the mashine hardware controler does not talk to the pc, it all lights up on start up but only shows Production and Performance Systen logo. I checked pc for latest updates all ok, I have tried reinstaling mashine 3 again through Native Access. but its failed, should I uninstall mashine 3 first through my pc uninstall programs? I am still a novice to NI Mashine
PC is a quad core i5 8G ram new 6months ago though my internal HD is small hence the 2TB USB 3 ext HD for Library