I couldn´t use the repair tool, as it loaded a blank screen.
Disabling hardware acceleration solved the problem, but Malwarebytes originally blocked the batch file. Once I had allowed it to run all was good
Thanks for the quick replies
I am running Malwarebytes on a Win 10 pc. It seems to be running normally but when I open Malwarebytes all I get is a blank screen. I have rebooted the pc, and the behaviour is exactly the same.