Problem Description:

Windows Server 2008 R2 Domain controller is failing to boot.

Error:
STOP: c00002e2 Directory Services could not start because of the following error:
The specified procedure could not be found
Error status: 0xc000007a.

Cause:

Missing parameters, diagnostics and RID Values keys underneath hklm\system\ccs\services\ntds\

Resolution:

Replace SYSTEM Registry hive in C:\Windows\System32\Config\SYSTEM with C:\Windows\System32\Config\Regback\SYSTEM.

To replace SYSTEM Registry hive it must not be in use. Please boot from OS Disk, go to Advance Recovery Options and use command prompt to replace the file. Also, make sure you take a backup of original file before replacing it.