Full explanation and steps to fix are here:
http://www.pcgamesn.com/how-to-turn-off-gamedvr-windows-10
If you don't want to make an account then follow the steps to edit the registry. I've done this and all is now well.
http://www.pcgamesn.com/how-to-turn-off-gamedvr-windows-10
If you don't want to make an account then follow the steps to edit the registry. I've done this and all is now well.

I realise I prolly don't deserve DMG but I'm in some kind of nightmare at the mo, solo queuing with Russian children. Any help would be greatly appreciated but if I'm honest just having a good laugh while playing would be good enough for me.