Ron has Windows Media Player and he has videos taking from an old pocket camcorder. Now Windows Media Player won't play the videos anymore. Leo says that Ron is probably in "codec hell," meaning that the avi file needs a codec that Windows doesn't have it. The Camera probably uses a strange codec that Windows 10 probably deleted along with Windows Media Player. And even though you restored it, the codecs are all gone. Leo recommends trying to play it with VideoLanClient instead.