Thanks but is the problem because of Adobe Flash Player because I can play YouTube in Firefox browser but not Chrome & Safari.
Ok I tried your link but I got this message when I tried to download:
Your Google Chrome browser already includes Adobe® Flash® Player built-in. Google Chrome will automatically update when new versions of Flash Player are available
Make sure you are using the latest version of Adobe Flash Player Software.
Any ideas ?
I can play YouTube in Firefox browser but not Chrome & Safari.
Chrome issues - post in their forum area or contact their tech support.
Safari issues - post in the Safari forum area.
Since the flash player works in Firefox, it appears your issues are browser related. Have you tried repairing permissions and restarting your computer?
Had the same problem and solved it after extensive research. Turns out that YouTube is surreptitiously enrolling viewers in a Trial Beta test of an HTML5 viewer. Go to this link, and if it says you ARE enrolled click the link at the bottom to "LEAVE" the trrial. This worked for me immediately!