That is an enterprise product and not really supported here. This forum is for consumer products. That said, I would be inclined to update to something more modern. I'll bet if you booted into safe mode, you could delete all of the files in that folder. Live update would then download the latest definitions.
Something is messed up there. You have virus definition folders from yesterday and today but your program shows it is using the definitions from October 2006
Hopefully it hasn't been like that for all these years.
You need to go to the Symantec business forum for support, we only support the consumer versions here.