Hi there. I've been rather stupid and transferred ownership of C:\, including system32, to my account (the administrator and only user). While I would instantly switch it back, due to an unrelated reason I restarted my computer (Surface Pro 4). Since then I've done research and found that it was definitely not a good idea to transfer ownership to begin with.
When I turn the computer on, it boots up normally until the point where it (presumably) leads to the login screen, but remains with the spinning-dots loading symbol. After some experimentation it still responds to the keyboard shortcut to change brightness. Also, upon CTRL+ALT+DELETE it goes to the normal screen except without any text. The buttons for wifi, ease of access, and sleep/shutdown/restart on the bottom-right are present and do work. When I hold down the power button the normal 'slide to shutdown' screen appears and is functional.
Is there any solution? Since I can't log in or access File Explorer (or Command Prompt) I can't reset permissions.
Many thanks for any help at all.