scram[wdk] you nailed it. Thank you for helping me fix this problem. Up until your post I was not aware of wbemtest so it took me awhile to figure out what to do with it.
For the sake of those you may have this problem in the future, here are the steps that corrected my issue:
• Go to a command prompt and run wbemtest
• Click the Connect button
• Replace root\default with root\securitycenter and click Connect
• You will be returned to the original screen, now click the Enum Classes button, leave the Superclass info box that appears as is (empty) and click OK
• On the Query Results screen, highlight AntivirusProduct and choose the Delete button.
• Close the Query windows and exit wbemtest
• Now either reinstall or repair Symantec Antivirus Corporate Edition
Interesting note, in my case when I re-entered the wbemtest after fixing my problem, the AntivirusProduct class no longer existed, even after a reboot. I can only guess this was a remnant of an older Symantec AV product or some other software package placed it there and it was causing a conflict with Symantec AV.