Need help with NIS 2009 to allow Windows Update to run

Greetings, all:

 

(This may have been addressed in an earlier post but I couldn't find it after searching, so please forgive my posting a topic that may have been answered all ready.)

 

How/Where do I change the settings in NIS 2009 to allow Windows Update to run on XP? Pre-Norton, Windows Update worked just fine so I suspect it's a firewall setting or two...three...four...   ...and what do I set them to? Strangely, I don't have this problem on my Vista Home Premium machine...which is a miracle in itself. :S

 

Ciao, and TIA for your help!