Youtube black screen problem

Problem
When opening youtube on my browsers only a black screen appears. I tried to re install the player but it kept saying I need administrative rights,  Even if I run the installer in administrator I still end up with the same results.  Here's what I did to solve my problem.

Solution
1.  I downloaded the uninstall program from adobe.
2.  Close all browser while the uninstaller is doing its thing.
3.  Download adobe flash player installer
4.  Close all browser
5.  Run the installer


Download adobe flash player uninstaller
http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

Download adobe flash player
http://get.adobe.com/flashplayer/

Note: 
Also check if your running adblock plus, adblock plus can block yoututbe somtimes