Microsoft have yet again released a broken update for Windows 10.
This one appears to cause any application which tries to play a Mpeg2 file to crash.
Other file formats would be ok as the issue is in the MPEG2 decoder.
I believe a considerable number of other video apps have been broken by this and Microsoft are hopefully working on fixing this mess of their own making.
Two solutions are 1) roll back the update or 2) Use a tool to set the MS MPEG2 / DVD decoders to be disabled.
http://www.thewindowsclub.com/codec-tweak-tool lets you disable them via the MS Codec tweaks button (bottom right corner)
Please note that any mpeg2 video thumbnail queries also cause it to crash so if you have a single MPEG2 based video (but not dream file as I think those have their own thumbnails) then the Deskscapes config will crash out when it populates the thumbnail list.