If you\'re Using WinXP, look if you have some \"FilterKey\" features activated in the \"Accessibility Options\" (i don\'t know the name of the menu in english, sorry) search in Control Panel, the icon with a green wheel-chair.
Another option is just changing your key config to something you like, for me i have the combination \'wasd\' to move, \'q+e\' to strafe and SpaceBar to toggle autorun.