For the last several weeks I have been unable to get passed the sign on screen of my PC. After putting in my 4 digit pin I get a message that states "credentials could not be verified." I've tried several different ways to bypass the log-in portion: starting in Safe Mode with Networking, Without Networking & by resetting my Microsoft password & attempting to log in with it. However, nothing works. Occasionally, I will receive the following error message: 0xc000006d, substatus: 0x0. I would be grateful for some assistance.