WordPress MU

Hello.
maybe this is a silly question for you, but i don+t find the way to uninstall my wordpress mu. Can some write it please? i would be really thankful.
regards

Drop the tables for it, and delete the files.

Delete the db too.

I've deleted all of the WPMU and database files, but I still keep getting these error messages on my site:

Warning: require_once(/home/cass2219/public_html/wpmu-settings.php) [function.require-once]: failed to open stream: No such file or directory in /home/cass2219/public_html/wp-settings.php on line 231

Fatal error: require_once() [function.require]: Failed opening required '/home/cass2219/public_html/wpmu-settings.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/cass2219/public_html/wp-settings.php on line 231

Eek!

And did you check to see if the file is there?