How to nuke PAM?

Hello! Because someone@suse decided to use PAM, I can't manage my system any longer. Entering a user in /etc/passwd and /etc/shadow or using useradd causes every normal program to find and authenticate the user. But some programs are infected with the PAM-virus and they don't find any of the users. It's no major problem, because noone needs tools like "passwd" or "proftpd". Is there any chance to nuke this virus out of the system without a complet reinstall? Yours, S.Willing