SYMPTOMS

CAUSE

Resolution

Taken from Symantec Website http://www.symantec.com/business/support/index?page=content&id=TECH102927&locale=en_US

WARNING: Do not clear the VirusDefs folder if LiveUpdate Administrator (LUA) 2.1 is installed. This will cause LUA to report that engine updates are corrupt until the next set of engine updates is released.

To solve this issue, follow these steps:

1. Stop the Symantec Management Client service by following these directions:
   1. Go to Start > Run
   2. Type smc –stop
   3. Click OK.
      
      
2. Stop the Symantec Endpoint Protection service in services by following these directions:
   1. Go to Start > Run
   2. Type services.msc
   3. Right-click on Symantec Endpoint Protection service and select Stop.
      
      
3. Navigate to <local drive>:\Program Files\Common Files\Symantec Shared\Virusdefs
   1. Delete any numbered folders
   2. Delete all files and folders with a ".tmp" extension
      
4. Install a new set of definitions manually using the Intelligent Updater (as explained in How to update definitions for Symantec Endpoint Protection 11.0 using the Intelligent Updater)
5. Restart the Symantec Endpoint Protection Service in services
6. Restart the Symantec Management Client service
   1. Go to Start > Run
   2. Type smc –start
   3. Click OK

Can't find an Answer Use Google below to search furthure.