I can not change my computer's volume when using Flash Player.

     I am running a Windows 7 64bit machine and prefer to use Mozilla Firefox. I always had to use various older versions of flash to not have this problem. I assume all the versions of flash player that did not have this problem are now out-dated and can no longer be used (I have tried downloading many previous versions and they did not work.) I decided to update to the current flash version 11.6.602.180 and got reminded about this problem I have. When I am using anything with flash player, I can not use my computers volume control; I would usually have to click on the taskbar or click on a page that is not running flash. Sometimes I can not even scroll down a page that has flash player active. I have not seen any solutions to this problem on forums and would like to finally get one.