Windows 10 problems! Videos won't play! Script not responding?

I recently downloaded windows 10.
videos now don't play on youtube, dailymotion, iplayer etc. The play symbol doesn't appear and the loading circle is in the middle of the screen and nothing happens.
also, very very often the internet screen freezes and script is not responding box comes up (ie. Up to three times a minute, or just straight after each other).
I have a Lenovo 2 in 1 laptop

Reinstall flash. These apps on the web sites should tell you to do that. Also, make sure you are using IE. No idea if or how well flash works in Edge.