Adobe Flash Player and Rosetta Stone

My Adobe Flash Player isn't working well with the Rosetta Stone website. It seems to have something to do with my microphone. Every time I enter a lesson that requires the microphone (which is often), a box titled "Adobe Flash Player Settings" pops up about 8-10 times. It has 3 tabs: A desktop screen with the "Play" arrow on it, a microphone, and a webcam. The desktop screen tab has a box which says "enable hardware acceleration." I check the box and click Close, but the same box continues to pop up 8-10 times. Finally, another box will appear asking if I want to allow the Rosetta Stone website to access my microphone. I have a choice of Allow or Deny.

I have clicked the allow button maybe 500 times, but this thing still happens every time I try to access a lesson on the Rosetta Stone website. I even added Rosetta Stone to the list of websites that are allowed to access my microphone and camera, but I still get these popups.

How can I stop these popups from appearing?

Also, I have a PC if that helps.