Home sharing not working on windows pc. Any help would be great!

I have recently obtained an Apple TV however I am currently unable to access my music on itunes via home sharing from my windows 7 pc. I have the latest version of iTunes, having updated it a few days ago, and have made sure that all of the apple accounts, networks etc that they are linked to are the same on all my devices but it still will not connect! As far as I am aware, it has nothing to do with my internet connection as we only have one router and my apple tv and ipad have no trouble connecting. Any help with this would be greatly appreciated!