iTunes and Windows 8 Home Sharing (Possible Fix)
If this fix has been posted elsewhere then I apologize, but I wanted to share what I stumbled on as a possible for for iTunes Home Sharing and Windows 8. I did a lot of port forwarding, both on my router and my Norton firewall, but nothing seemed to help. After a few minutes my Apple TV and iOS devices would stop seeing my iTunes library. The only way to fix it was to reboot the router.
On a whim I looked in my Device Manager and found under Network Adapters a device called Microsoft Kernel Debug Network Adapter. I disabled this, rebooted my computer, and have since no issues with Home Sharing. It's only been a few hours, but that is the longest I've gone since installing Windows 8. I'll look in the morning to see if it still works.
So give this method a try and see what happens. Hopefully it will fix your problems.
Windows PC-OTHER, Other OS, Windows 8 - 16GB - nVidia 560 Ti