Flashbuilder is unable to find FlashPlayer.exe
I just installed the release version of Flash Builder 4 after uninstalling Beta 2.
Besides some other problems, I am unable to launch any of my applications in Flash player.
When I try to run/debug/profile I get these error messages:
C:\Program Files (x86)\Adobe\Flex Builder 3\Player\win\FlashPlayer.exe %1
Flash Builder cannot locate the required version of Adobe Flash Player. You might need to install the Flash Player or reinstall Flash Builder.
Do you want to try to run your application with the current version?
followed by (if I click 'Yes'):
Cannot run program "C:\Program Files (x86)\Adobe\Flex Builder 3\Player\win\FlashPlayer.exe %1": CreateProcess error=2, The system cannot find the file specified
Pictures of the error messages and my preferences:


From the looks of it, Flash Builder is looking in an obviously wrong place for the player executable. I can't seem to find out if this is something that is controlled by my preferences/setup or internally by Flash Builder.
So, what do I have to do to change where Flash Builder looks for the debug Flash player?
Help would be greatly appreciated.
