The owner of my company has a Surfacebook with Windows 10. Not sure what he did or how he did it, but he has removed permissions to the C:\ drive. Windows will boot up and can be logged in to. Nothing will run and there is no access to any files/utilities/programs on the drive. No utilities can be installed. When I try to change ownership of the C: drive the system just hangs.
He deleted all other users to the system as well.
We can't access system restore and what he thought was a rescue disk seems like it just has a password key.
Any idea on how to take ownership of the drive and add in permissions to get back into it?