Thanks Ric,
Forced to Windows 10 - Auto update kicked it off and it was almost done by the time I realized.
Like I said - i'm not the most technically minded person in the world so I wouldn't know how to stop this.
Would I like to go back to WIN 7 - yes I would if I knew how to without having to re-install everything else.
I really didn't want to have to install yet another program to run videos but I guess I have no choice. This is probably the most frustrating thing about Microsoft. Move to our new OS it's full of fabulous new features. Oh, but wait a minute, all that software that you spent loads of money on will no longer work. I realise it's about being able to continue support but not eveyone wants to change.
I spent a significant amount of cash on Flight Sim 4 for instance - and now it won't run under Windows 10 except in a window - not much use for muti-screening - like I could on WIn 7.
Thanks for the answer, I will give VLC media player a go.