workgroup computer is seen but can't be accessed

In my home I have 1 Desktop (XP Home, ethernet connection to internet) and 3 laptops (XP Home, Vista, Win 7, all connect wirelessly).  Since I set it up 8 months ago, all have seen each other and been able to access each other's files.  Today, I can see all the wireless devices and they can access each other - but the wired device can't be accessed by any of the other laptops.

The desktop computer can access the Win 7 computer via a shortcut I made a while ago - but when I try to drill down to that and the other computers via My Network Places - I can't browse to them.
All have Norton Internet Security 2011 - and the network map function sees all the computers and all are trusted.  The desktop does NOT have Windows firewall enabled.  I suspect the sudden change in my situation is due to a Windows update I did in the last few days, but I don't know that, and if it is, I'm not sure what changed and how to solve it.

I've un-enabled file sharing on a few folders on the desktop and re-enabled them - that did not help
VillageacAsked:
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hrr1963Commented:
To narrow the problem, disable the internet security (firewall) and verify if the problem is solved. Please reply.
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VillageacAuthor Commented:
THANKS!  Facepalm - great advice.  The desktop's NIS - if I turn off firewall problem solved.  I will call Norton TS and have them guide me though fix - unless you got the tweak I need to do on the firewall - I looked at it just now - but I'm not sure what setting to change or where I should be looking for that setting.

Thanks again
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VillageacAuthor Commented:
Never mind - I found a setting to reset firewall - Voila.  Thanks so much!  My mantra for my tech problems at work are reboot then  bother me.  I now need to add "disable all firewall AV" to the mantra
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