Realtek Audio Driver not loading in Rekordbox

Why doesn't Rekordbox recognize my laptop audio driver.  It was playing then I accidently clicked Realtek ASIO and now it will not play, when I select the laptop Realtek Audio driver, it hangs then doesn't load. The driver is there, as I use another DJ software program and it works fine.  What would be the issue, am I missing something?  Thank you