My iphone and my computer are no longer communicating

I tried to get a new application for my son on his computer and then transfer it to my iphone, but when I did, all of my applications got wiped out. Then when I went onto my computer, the iphone never came up when I connected them. All of a sudden, it was like my computer and my iphone were not recognizing each other. Does anyone have any idea what to do? Thanks.

Sounds like 2 problems. The first is because the iPhone can only sync with one computer at a time. If you sync it to a different computer it replaces everything on your phone with content on the new computer. It warns you about this, but you apparently went ahead and did it anyway.
As far as the computer no longer recognizing the iPhone have you tried rebooting the computer ad the phone? Here are some additional tips on resolving this problem: http://support.apple.com/kb/TS1495

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