Windows 7 Home Sharing Problem (wireless/ Ethernet)

Hello
I spent a few days trying to figure out why home sharing didn't work. I've got 2 windows 7 pc. So comptuer A can detect computer B iTunes library but computer B cannot detect computer A library although the settings such as allow sharing on iTunes preferences are all checked.
Comptuer A was connected using ethernet cable and computer B was using wireless. Both are desktop at different location of the house connected to the same network.
So when I insert an wireless adaptor to Comptuer A and conects it wirelessly to my router, the homesharing appears. Whereas when i connect it with an ethernet cable, it fails.
Is there anyway to troubleshoot this issue?
Thanks

I was able to resolve my issue. Here's how:
Did a lot of research on this. I have a Linksys WRT120N router where the only device not on Wifi was my Windows 7 PC (it was plugged in with an Ethernet cable while everything else was on Wifi). Having fiddled with the router settings to no avail, I went out and bought a Wireless USB adapter to put the Windows 7 PC on Wifi.
When I set that up, I could now see my Windows 7 library on the Apple TVs. However, when I went into the library, it was stuck on "Loading Library" in perpetuity.
I looked in my list of Windows services running (Start -> Control Panel -> Search for "Services") and noticed that, even though I disabled the Windows Firewall in the System and Security settings, the Windows Firewall service was still running. I disabled the service (right click -> properties) and restarted the computer. Voila, it works now.
It is possible that the problem was the Windows Firewall service (not the Wireless), but I've read countless posts where people had issues with the devices being on wired and Wifi and not seeing each other. As such, I haven't (and don't plan to) tested it back with just the Ethernet cable. If you're having my issue, you can try that first.
I should also note that when this wasn't working, I was also unable to use my iPhone to pair as a remote with iTunes. It would pair but the iPhone would be stuck in "Looking for" when I tried to control the library. This is now also fixed after doing the above.
Hope this helps anyone else frustrated out there.

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