There is a massive bug with the Radeon Graphics drivers currently. I've had to roll back to this previous version of the driver (22.19.677.257) as the most recent makes my Windows Start and Cortana not work at all. However, on this rolled back version I can't get any media to playback.
I've done two completely fresh reinstalls of windows from certified Windows DVD install disk. I've even replaced my Hard drive as I thought perhaps that was failing. It was only when I decided to try rolling back the drivers that seemed to change anything. Now at least my start bar and Cortana are back but I have work I need to do for a client and can't currently do it as none of the media stuff like 'Film & TV' app are working. Yes, I've installed VLC etc and stuff doesn't even playback through that.
Thanks in advance.
Radeon Software Version
AMD Radeon R9 200 Series
Windows 10 (64 bit)
Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz