Domain Administrator account.  C:\> GPRESULT /R    we get ERROR: Access Denied.    ??

We have a Win2008R2 server giving us a headache, just started the other day, after we ran a Windows Update.    Only One role on this server which is Remote Desktop Services.

We seem to now be a RESTRICTED user even though we are logging as the Domain Administrator.    

My 1st hint was when running C:\> GPRESULT /R    we get ERROR: Access Denied.  
The related rsop.mmc also fails also "Access Denied"
Other commands return "not enough space on the disk",
   such as trying to run  

C:\Windows\System32\wbem>mofcomp scersop.mof
Microsoft (R) MOF Compiler Version 6.3.9600.16384
Copyright (c) Microsoft Corp. 1997-2006. All rights reserved.
Parsing MOF file: scersop.mof
MOF file has been successfully parsed
Storing data in the repository...
An error occurred while opening the namespace for object 1 defined on lines 10 -  13:
Error Number: 0x80070070, Facility: Win32
Description: There is not enough space on the disk.
Compiler returned error 0x80070070

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Lots of space 100+ GBs free on C:.   Somewhere the Computer is restricted.     I just can't figure how to narrow it down.  
All of the issues seem related.  I've seen on this for days,   I sure need some fresh ideas on how to fix.

Please share some clues !