VirusScan Enterprise is installed on the same server as GroupShield. They both use the McAfee Common Management Agent.

The Agent automatically checks for updates for all products installed on the same machine, and therefore only one product needs to have a scheduled update task configured.

Solution
   1.  From the GroupShield console, select Scheduled Tasks.
   2.  Click Delete to eliminate updates.
   3.  When the dialog for task permanently deleted is displayed click OK

Run update again

If this does not work download and install the latest superdat from here

Source: McAfee