How to Restore Windows Photo Viewer on Windows 10
Attached are the two-part ways on how to restore windows photo viewer on Windows 10.
1: https://www.youtube.com/watch?v=Y7HeVd1ZNjA
2: https://www.youtube.com/watch?v=_AW-x0ALC6o&feature=youtu.be
Follow the instructions on the video and you'll be able to restore your Photo Viewer.