Youtube videos wont play in Firefox or IE 11

[Beautyifull]

I been trying for a few days to play my youtube videos but they will not play in neither one of my browsers

[pwillener]

What exactly means "will not play"?  What do you see instead of the expected Flash content?

[Beautyifull]

It started working but it stopped again. The video starts to play then after about 2 or 3 seconds it shows a black screen that says "An error occurred please try again later. Im using windows 7.