I have a really weird problem. I recently updated my Windows XP SP3 desktop to iTunes 8 and now the apple tv I have synced with the desktop will not show in the devices list. I don't have Windows firewall or any type of firewall present between my PC and the apple tv. I can share out my library and view it from two other PCs connected to the same network. Those other two PCs can also see the apple tv and they have been upgraded to iTunes 8 as well. Finally, from my main desktop, I cannot see any libraries shared from the two other PCs.
Any Google search, including ones that sent me to the Apple site, have not returned any useful information.
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