Server 2012 A D stopped working

Active Directory Domain Services shut down on server while users were logged onto server using QuickBooks Enterprise Solutions 13.0. Users workstation froze and was restarted but could not reconnect to server. When we checked the server it had a message up stating the computer had to restart and it was creating a file. The error number is 0xc00002e2, after restarting it kept recycling so I restarted in safe mode using the Directory Services Repair Mode.

Event Viewer only showed the Active Directory Domain Services not started  with the following details:

Internal error: An Active Directory Domain Services error has occurred.

Additional Data
Error value (decimal):
-501
Error value (hex):
fffffe0b
Internal ID:
160207c9