Hello,
I think that the DC is trying to do Sync with other DCs. I would also like to see the status of the KDC (Kerberos Key Distribution center), Netlogon, DFS services.
PLease see if you have a "pre-existing" folder under sysvol. If yes, please take a backup of complete Sysvol folder, cope the contents of the "pre-existing" folder and paste under sysvol (original location).
Then follow this article to make this DC authoritative foe sysvol replica set :
http://support.microsoft.com/kb/315457This should fix your Sysvol issue. Once you bring back the virtual machines, make them non-authoritative for sysvol (follow same article).
Once you do this, open dssite.msc (Active Directory Sites and Services). Browse to the DC, expand it and right click on the NTDS Settings. Check the option that says Global Catalogue. See if it does that and you stop recieving GC errors.
Regards,
Arun,