how to restore the system RHEL from the previous date



Hi,
I have installed the yum server ,after that i have enabled some
servers like NFS,SAMBA .But when the rebooted the machine it is taking
lot of time in rebooting ,it takes lot of time in enabling SAMBA
services ,Now i want to restore the system from the previous
date .Please guide how to do it .






Thanks and Regards
Nagendra Rathore
Email:nagendrarthr@xxxxxxxxx
.