MAWILE'S PROFILE

I'm sorry for bumping an old thread, but this has happened to me too. I haven't played as much as before since I got a new computer, but it's happened to me with two different RPGMaker games now.
In the menu, my up arrow gets stuck and I can "unstick" it by pressing down, but then when I've left the menu to actually start playing, the character runs off, usually to the left. I've tried pressing the different arrow keys or other buttons the game uses, but it doesn't help. I have no idea what's causing this and I'd really love some help.
(And I've read this thread and no, I have no joysticks etc.)