I am sure that it is not a requirement for them to have a service. Soundmax does..from the sounds of things, Realtek does not. So, I guess I should of made the comment that each configuration is different and you may not have a service listed for your sound (apart from Windows Audio).
Sorry Jason, never got back to you. I reinstalled Photoshop and everything is fine. I have no idea why photoshop was messing with the soundcard though!
Cheers!