I can't find a way to update Norton of these - so I'll go this route. I'm a neophyte but I am very flustered that we had to use a non-Norton anti-virua/malware program to detect and remove 3 on my computer and 6 on my husband's computer! We diligently run scans and maintain these computers. (we are on 2011 and about to upgrade to 2012)
I wanted to inform Norton of these:
1)PUM.Disabled.SecurityCenter
2)Trojan.Downloader
3)Trojan.Downloader
and
1)Trojan.Dropper
2)PUM.Disabled.SecurityCenter
3)Trojan.Downloader
4)Trojan.Downloader
5)PUP.CNET.Adware.Bundle
6)Spyware.OnlineGames