Why is Norton 360 messing with my system?

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Here's the setup:

Comp A Win Vista 64 with USB Canon printer connected -- Router -- Cable Modem

Comp B Win XP 32 -- same router.

 

I have everything working fine Comp B was able to print to Canon printer until I installed Norton 360 4 days ago. I have tried everything short of deleting Norton 360, which is on both computers. My Network see both computers but I can not figure out how to get Comp B to connect with the printer. I have file sharing on on bothe computers, tird having Comp B search.... and nothiing seems to work.

 

I really need this corrected, as I have to share the printer with others. What can I do?

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