Original post : 0xc0000001: Fix for Windows XP, Vista, 7, 8, 8.1, 10.
Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:
1. Insert your Windows installation disc and restart your computer.
2. Choose your language settings, and then click "Next."
3. Click "Repair your computer."
If you do not have this disc, contact your system administrator or computer manufacturer for assistance.
Info: A required device isn't connected or can't be accessed.
Windows Recovery Environment
Your PC couldn't start properly
A required device isn't connected or can't be accessed.
Error code: 0xc0000001
You'll need to use the recovery tool on your installation media. If you don't have any installation media like disc or USB devices, contact your system administrator or PC manufacturer.
Press Enter to try again
Press F8 for alternate boot options
Security Accounts Manager initialization failed because of the following error: A device attached to the system is not functioning. Error Status: 0xc0000001. Please click OK to shut down this system and reboot into Safe Mode, check event log for more detailed information.
C:\WINDOWS\repair to C:\WINDOWS\system32\config
copy C:\Windows\Repair\Sam C:\Windows\System32\Config
This will remove all login credentials your Windows copy has, including username and password and revert back to the original username that was added when you installed Windows.
chkdsk C: /f
sfc /scannow /offbootdir=D:\ /offwindir=D:\Windows\