Problem with Realtek HD Audio Manager

[Lloyd Te Kani]

Hi guys, I am aware that this isn't a Hoster problem but someone might be able to help sort this out for me anyway.

Had a gig last night and during set up, I accidentally hit the "Set Default Device" button in my Realtek HD Manager. I was using a usb sound card at the time and the sound stopped immediately and it didn't matter what I tried, it would not work again. I finished the gig by using the h/phone output but the sound quality wasn't as good. Any idea how I can reset?