Wired home network and NIS 2010. Is it the firewall?

I just set up a home network mainly for my home theater. Everything works good except for a minor detail. Here are the stats:

 

Network consists of a wired Cisco Linksys cable router conected to a cable modem. Conected to the router is one HP windows 7 computer, one Sony TV and one Seagate NAS. All are latest tech( windows 7  and DLNA compatability.) The router I am not so sure about Windows 7.

 

So here is the problem, when connected through the router the devices can not totaly discover each other and communicate. The internet connection works fine on both the PC and the TV so that is not the issue. The real problem is that the TV and PC can't discover the Seagate drive and access it. The PC does to the point where it shows on the windows network map but the seagate discover software on the PC can't find it. The TV cant find it at all. Also the TV doesnt show up on the Windows map at all.

 

The funny thing is when I open the NIS network map all devices show up with IP adresses and all set to full trust level. This leads me to believe The problem is with the current Norton settings and it's not letting the devices communicate. Why would all devices show up in Norton and not Windows? I have enabled PnP on everything, opened file sharing on everything, set trust levels as high as they can go and still nothing. Here is what I tried so far:

 

SEAGATE DRIVE: Connected directly to both the PC and TV and everything works fine. All sharing and anything else I could think of is set to full access. After a lengthy tech call with Seagate they blame the router.

 

 CISCO ROUTER: I pinged the NAS from my computer through the router and it came back fine. I guess thats why Windows can see it but somehow cant fully communicate with it. After a lengthy tech call with Cisco they say the router is working properly.

 

So here I am looking at NIS. Why doesnt the TV discover the NAS or my PC media server? Why doesnt my PC see my TV? Why doesnt anything discover the NAS? If it all shows up on the NIS network map why doesnt it pass through to everything else? My only option at this point is to uninstall NIS and see if that works. I dont really want to do that so anyone have any suggestions?

 

Randy