All of a sudden I can't watch any music videos or YouTube on my computer. What went wrong how can I fix this?

Try same internet connection on another PC if still the videos not working call ISP
If worked, uninstall Flash player, and re-install it from here

Can't watch videos on my PC.was watchg it before but don't know what went wrong with my computer amymore.install all kind of flash bt never worked for me.pls help

Try to Install the Latest Version of Adobe Flash Player.