I am using Windows XP and flex builder 3. Here is the error I am receiving:

I am trying to debug a flex application by toggling a break point. When I try to debug, I get the above error.
so far the only thing I installed is flex builder 3.
Install in this order and you will be able to mitigate this problem. It took me a little bit of trial and error.
step 1: http://get.adobe.com/flashplayer/
step 2: http://download.macromedia.com/pub/flashplayer/updaters/10/flashplayer_10_ax_debug.exe