I can't connect my iphone 4 (white version) to my PC. WhY?

  itunes has been installed. The error message prompted "MTP USB device failed."

Disconnect the phone and open device manager. Uninstall the 'unknown mtp usb device'. Reboot the pc, plug the phone back in and if needed, let it scan for new devices.
The error is related to Windows 7 and camera devices (which the iPhone appears as to Windows).

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