Sound For Toggle Keys Not Working

I use XP Pro with service pack 2 and never had trouble with sound from my toggle keys. I go through control panel and the accessibility options then put a check mark in toggle keys hit apply and ok, the check mark disappears and I have no sound when I hit the cap lock button on the keyboard, the way I have used it before.I also click on the sound tab and put a check in the use sound sentry check box so it will flash the screen when I accidentally hit the cap lock button. I've never had a problem with these functions before now nothing will stay checked or function at all.