I read your other post. Any system changes have to be done by the administrator. This is what keep Linux users from hosing their system with one wrong delete. You have to do it on purpose. Remember when you installed it, you had to enter a password for the root user? You gotta do that. From KDE or Gnome or whatever, you gotta open a terminal and type "su" without the quotes. enter the root password. Now you can screw up your system to your heart's content.
Before you do anything rash, like going back to BSOD, er win98, try taking about 45 minutes
and bring yourself up to speed with Linux. More specifically, take an hour or two
and learn about that great distro you got yourself involved with.
Sounds like your sound card module didn't get loaded. perhaps if you run alsaconf (as root), your card can be recognized.