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1. Download and install iExplorer, a free Windows utility that lets you access your iDevice in the same way you'd access, say, a flash drive.
2. Run iExplorer, then connect your iPhone or iPad to your PC via its USB cable. The program should immediately detect the device and provide you with a Windows Explorer-like view of its contents (mostly file folders). I should note right here that if you navigate to Media/DCIM/Apple###, you should see your missing photos. Feel free to copy them to your desktop if you want an immediate backup/rescue.
3. You're now going to locate four files. Each one should be dragged out to your desktop (effectively making a backup copy), then deleted within iExplorer (i.e. deleted from your iDevice). These are the files:
4. After you've deleted all four files from your device, close iExplorer, unplug your USB cable, and then reboot your iPhone. (That's done by holding down both the Power and Home buttons for several seconds, until you see the Apple logo.)
After the reboot, head to the Photos app and check your Camera Roll. It may take a minute or two for all the photos to reappear--but they should show up.