Moving this discussion to the Installing Flash Player forum.
I would reset the browser. If it is IE, go to tools, internet options, then choose the last tab called advanced. Then click the "Reset" button. Close out the browser, then re-open it and try to watch a youtube video. If that works, then you are all set!
Thank you, it worked, I am all set and my frustration is over. Thank you!
Awesome! Glad I could help. Please click 'correct answer' or 'helpful' so others can find the correct way to fix this issue. Plus I also get credit