STOP: c000021a {Fatal System Error} The initial session process or system process terminated unexpectedly

I'm encountering such an error after expanding disk (done by Hyper-V) space on virtual machine.

STOP: c000021a {Fatal System Error} The initial session process or system process terminated unexpectedly with a sta开发者_开发百科tus of (0x00000000) (0xc000012d 0x001003f0).

The virtual server there is Windows Server 2008 R2 Enterprise Edition, which is also Domain Controller, now my whole environment is down :/ I've tried to repair Windows - but there is no restore point, and using command line, I've also tried the sfc /SCANNOW /OFFBOOTDIR /OFFWINDIR, but got error "Windows Resource Protection could not perform the requested operation"

I initially responded to this question to ask if Christof ever found a solution. That's not allowed, so my post was deleted.

I'm back to share that I solved the above problem for myself using a mix-and-match set of backed-up registry files.
I believe the only reason this worked for me is that there had been ZERO changes to the server between the different times the registry files were backed up. Most of the registry files I used in the recovery were from c:\windows\system32\config\system\regbak, but the SOFTWARE file had a timestamps too close to the time of my initial failure, so I used one that I had created in \windows\tmp when I initially began this recovery process. I followed a guide which apparently was deleted but you can find references by searching on site:microsoft.com kb307545, Also make sure you have a backup of the COMPONENTS hive/file.