New here. I upgraded to windows 10 this morning and since doing so my speakers are turned off in windows. I have hunted everywhere to turn them on and can't find how to do it and also I can not play videos on youtube. It just gives me an error. Before I upgraded both speakers and videos played fine. Anyone have the same issue? Any ideas how to sort this?
I am not very pc friendly. If you can help please talk to me as a complete beginner because I pretty much am.

Thank you for any help.