How can I get my Apple TV 3 to see me iTunes library again?

I have the following setup: my main computer (Windows 8) is connected via LAN to the router (it has no wireless adapter), and all other devices are wireless (that's three iPhones, an iPad, an Apple TV 3 and a Macbook Pro (Latest Mountain Lion)).
Everything was working fine until last week; the only thing that I can think of that changed is that I updated iTunes everywhere.
Now none of my devices will admit to seeing my main iTunes library (the iPhones and iPad in Remote, the Apple TV in Computers, the Mac in iTunes).
What gives? I've tried everything: signing in and out (and in and out and in and out) of Home Sharing (everywhere); changing Apple IDs everywhere; rebooting the router; rebooting everything else (including unplugging from power); yelling my lungs off at the stupid Apple TV for its "iTunes libraries... will appear here" for no good reason really.
Help!
(Obviously what I really care about is the ATV3 recognizing my main iTunes library's existence...)

Hello Polindrom,
Thank you for using Apple Support Communities!
First thing I would do is restart your network router and computer. If that does not resolve the issue it sounds like you may have to uninstall iTunes and its associated softwares with this article:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
All the very best,
Sterling

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