The Engine is running a very older version. Download the latest Superdat file from http://www.mcafee.com/apps/downloads/security_updates/superdat.asp?region=us&segment=enterprise and run this using /f switch
Example: c:\download\sdatxxxx.exe /f
you will need to reboot the server after this. Now, run an update task and you should have your DATs updated to the current version,
Also, you should consider upgrading to GSE 7.0.1 as 6.x is going to be EOL'ed soon. you may have a look at http://www.mcafee.com/us/enterprise/support/customer_service/end_life.html for EOL information.
That seems to have worked on the first server. I will see how that handles future updates and then perform the same proceedure on the other two servers we have here.