ITunes 10.2.2 Home sharing

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Hi!  I am using iTunes on my PC runing Windows Vista.  I am trying to use home sharing.  The other PCs can see and share my library easily but I cannot see or share either of the other libraries.  I have noticed that my iTunes does not have the "Look for shared libraries" tab available under preferences; it simply is not there.  I have checked the option of sharing my library.  I have tried pretty much everything I've seen suggested with no success.  All three PCs are signed in under the same Apple ID.  I am signed out of the iTunes store.  The computers are all authorized.  I don't know what else to do.  Any suggestions are definitely appreciated.  Thanks!
im having the exact same problem! can someone please help us out?
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