My iphone doesn't connect to my computer?

I tried restarting my bonjour and setting it to automatic, changing ports, using another cable, upgrading my itunes, restarting my computer, and upgrading my computer but nothing works. My computer is an HP running on windows 7 and my iphone is a 5.So everything is fairly new. I tried my friends computer (which is an older computer running on vista) and it works but i hate his music lol. I need help!

What message do you get when you try and connect?

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