Computer won't recognize iphone

My iphone was syncing to my mac, however, I plugged it into my girlfriends pc laptop and now it wont sync with my mac? it doesn't recognize it. Do I have to "unsync" it from the pc? How do I do that?

rbud,
I sync my personal iPhone with both a Windows-based PC and a Mac.
Has there been any other changes on your Mac such as installing Leopard?
Thank you,
Nathan C.

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