If I type su, it asks for a password but it doens't allow me to type anything after 'password: ' so my password is always seen as incorrect. Therefor I cannot run the alsaconf command either..
When it gives you the password: prompt, it purposely blanks out what your typing, so you can't actually see anything. But if its some problem deeper than that, you can always just login as root when you boot up, and then just run the alsaconf commad.
As for the module error, no idea. I never had to deal will sound modules because alsaconf did them for me.