Most of the controls are "greyed-out" and I can't access the 'advanced controls' either. Any help with be appreciated.
You logged in as "administrator"? I know vista is pretty finicky about that and doesn't let you adjust much if you're not.
Yeah I am, maybe it's got something to do with Realtek
Could be. Check your Realtek control panel. I remember that I was able to adjust my settings from there before I re-installed my soundcard. Perhaps you just didn't enable the "work with windows mixer" option thing (not what it was called, but you'll know it when you see it).