iPhone don't sync in Windows 7

Disabling USB is the one solution. Click Start, type DEVMGMT.MSC and  to launch Device Manager, then click View > Devices By Type. Expand the Universal Serial Bus controllers section of the tree, right-click each USB Root Hub entry in turn, select Properties > Power Management, and clear "Allow the computer to turn off this device to save power".
Reboot your PC after this and try again.

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