system users does not exist

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sir/madam
Hi
in my system i have installed fedora core-3
and i dont know why some system users are deleted from /etc/passwd
file and when i start some services like postgresql , sendmail etc
the system says system user "postgres" does't exist
i have some important data in my system. so pls tell me hoew to include
these system users again without reinstalling the packages.
i tried with forcebly updating the rpms. but didn't solved the problem

Thanks/Regards
Mallikarjun Mudumali
9880023898
Thanks/Regards
Mallikarjun Mudumali
9880023898

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