problem with multiple keypresses and mame

[redfivexw]

i have an upright cabinet running GameEX frontend with mame32.  I have an ipac usb interface for a keyboard encoder.  i have got everything working great, but sometimes when i am playing a game and it is a fighting game, when making a lot of keypresses i get an error and the screen goes black.  i can still hear the game but i cannot get back into the game, windows gives me a "sticky keys" error.  anyone know how to cure this?

[JoyMonkey]

You can disable stickykeys by going to Control Panel>Accessibility Options and unchecking "Use Sticky Keys."