this is the content of my grub file
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:   You do not have a /root partition. This means that
                 all kernel and initrd are relative to /, eg.
                 root (hd0,0)
                 kernel /boot/vmlinuz-version ro root=/dev/sda1
#               initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=10
splashimage=(hd0,0) /boot/grub/splash.xpm.gz
password --md5 $1$hSC1jN. h$xiis3FXQmaNW6V4d.GLq51
title Red Hat Enterprise Linux WS (2.4.21-4.EL)
         root  (hd0,0)
         kernel  /boot/vmlinuz-2.4.21-4.EL ro root=LABEL=/
         initrd  /boot/initrd-2.4.21-4.EL.img
title DOS
         rootnoverify  (hd0, 1)
         chainloader +1
My output of fdisk -l
Disk  /dev/sda: 160.0 GB,  160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device   Boot     Start             End         Blocks        Id       System
/dev/sda1   *            1              704       5647288+     83       Linux
Partition  1 does not end on cylinder boundary.
/dev/sda2              704          19458    150641664        7      HPFS/NTFS
Thanks.