Ok, this is bad.
This is what I get when I try to su root: su: cannot set groups: operation not permitted.
When I try to access the Mandrake Control Panel, it tells me I have insufficient rights, when before it asked me for a password.
I can't log in as root either because Mandrake 9.1 gives a list at boot, and root isn't on it. Just my user.
Please help, because I don't want to have to reinstall (if I could do that without losing my data and setting however, that's another question