To check and make sure that the correct permissions are assigned to the service account is to test the following to replicate what the DGE service is attempting to do:
1. Log on to the DGE server machine as the domain service account.
2. Navigate in windows explorer to \\<agent host>\Admin$
3. Attempt to create a directory and create a file in it.
In addition to the above, the DGE server will also attempt to create some registry keys under HKLM\Software\Quest Software, and if all that succeeds, finally add a service to the SCM on the agent host.