Error During Installation Adobe Flash Player 11

Greetings!
During the installation for my Adobe Flash Player 11, it keeps on getting stuck at 50%, then an error saying “Application currently in use” shows up.

I know this is a common problem and the solution is simple: turn off the application.
Problem is, I tried to do that and several other things like: clearing my flash folders, rebooting my machine, shutting down all background programs.
I also tried to directly download the Flash 11 installer, however I end up with a blank error window.

Can anyone else help me with this?
I tried everything I could think of, but it still doesn’t work.
Thank you!
