ITunes home sharing mac and pc?

My family has a mac computer and I have recently got a pc. I have bought many movies and songs and apps on the mac for my iPhone. But that computer has no more space to download more music and I want to do it on my PC I downloaded a few songs on my laptop but when I went to put them on my phone it said that if I wanted to do that I would have to delete all the stuff on the mac. I'm using home sharing thing but still not working what do I do?

You need to Authorise the new computer in iTunes and then all your old stuff will be available to it…

http://support.apple.com/.../kb/HT1420

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