Group policy for active directory not available

[DanglingPointer]

Hi I am trying to set up group policy from the Active Directory snap-in, by accessing the GP tab of the properties of a domain (our only one).

I get the error message:

"Failed to find a domain controller. There may be a policy preventing you from selecting another domain controller. Details: Network path not found"

And the GP options are just greyd out..

I get the same error when using the GPO snap in; I am presented with the default of using the local computer GPO and when I try to browse for the domain GPO I get the above error.

I am at my wits end - can't find anything on the Microsoft support pages. Any help much appreciated.