iTunes Home Sharing PROBLEM!

There are 2 computers both PCs, they are both authorized on itunes, both have home sharing turned on, firewalls off,homesharing is on one account, preferences sharing entire library, i have checked everything. My problem is that one computer can see the other person's itunes library thru homesharing but the other one cannot. How do i make the other computer detect my itunes library on its homesharing?

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