Server 2008 unlike its predecessors, comes with the multiple remote desktop session restriction enabled. If you are only connecting to a server for remote administration purposes that can get a bit annoying, especially if you have a generic administrative account that multiple techs are using, and you keep kicking each other off the server.
After installing DHCP on Windows Server 2008 R2, you may start to see the following error message in the event logs :
Volume Shadow Copy Service error: Unexpected error calling routine RegOpenKeyExW(-2147483646,SYSTEMCurrentControlSetServicesVSSDiag,…). hr = 0×80070005, Access is denied.
Inspection of the detailed tab of the event log entry will show information about the process that generated the error. Take note of the user mentioned after the “- User: Name:” portion of the bytes. To resolve this error, simply give that user full permission to the HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesVSS registry key.