Hi, everyone

After running Windows Update on my Server 2012 R2 memeberserver this evening, I am no longer being able to log to the server both remotely or locally. I cannot either access any resources on the server.Remote connecting the computer (as an domain admin) only allows me to read the local user groups and there I can see that the "Administrators" group are missing.

Anyone experienced similar issues or have any ideas how to resolve this? Just to clarify, I cannot access or logon the server in any way.....

Here is a screenshot of the local groups that are visible for my through Computer Management from another server: