Norton Sec missed 9 viruses/trojans on 2 computers

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