You've tried pressing the letter "X" key? :/
Does pressing X make the A button in the "GCPad Configuration" window turn red?
yes and yes.
this is windows 7 btw.
edit: and when i press the X in GCPad Config it changes to a random number or letter. it didnt do that when i tested it on XP.
Huh? Which keyboard layout are you using?
i think something is up with the computer itself. i just tried testing my GBA emulator and the same problem is happening. all the buttons used to work just fine. any thoughts about that? would it have to do with something regarding num locks, sticky keys, or system restores? stuff like that?
and in response to your question. i'm using the keyboard layout that is shown on the screenshot. i think....

I meant which physical keyboard layout. (like QWERTY)
yes its a qwerty keyboard