iPhone is recognized as USB Composite Device after iOS 7 "upgrade"

I couldn't upgrade to iOS 7 yet — the system fails before the upgrade could be completed. After the backup of iOS 6.1.2 to iOS 7, my PC doesn't recognize my iPhone 4s anymore. It is recognizing the USB port as USB Composite Device instead of Apple Device.

The screen that appears on my iPhone is:

But I can do nothing. My iPhone is stuck. The only thing that I can do is shutdown it, but when It is restarted, the "Connect to iTunes" screen reappears.

Someone has any idea?