Redhat problem

[Sanjaasuren.I]

Dear all,

i have a problem with the linux redhat. 
When i try to login the system authentication failed messages give back, but i did not change the pass
and when i try to chage pass by 'passwd' then appears "passwd: Module is unknown"
and there is some messages in the /var/log/messages:

Apr 30 11:33:40 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_limits.so: cannot open shared object file: No such file or directory]
Apr 30 11:33:40 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_limits.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_deny.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_deny.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_deny.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_env.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_env.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_env.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_unix.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_unix.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_unix.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_deny.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_deny.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_deny.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_succeed_if.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_succeed_if.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_succeed_if.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_permit.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_permit.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_permit.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_cracklib.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_cracklib.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_cracklib.so
Apr 30 11:36:16 backup sshd: PAM unable to dlopen(/lib/security/$ISA/pam_limits.so)
Apr 30 11:36:16 backup sshd: PAM [dlerror: /lib/security/../../lib/security/pam_limits.so: cannot open shared object file: No such file or directory]
Apr 30 11:36:16 backup sshd: PAM adding faulty module: /lib/security/$ISA/pam_limits.so

Anybody can help me through this?
or Do i need to reinstall pam rpm packages or not?

Best Regards
Sanjaasuren
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