Unable to dual boot from Oracle Unbreakable Linux to Windows partition.

I have installed Oracle Unbreakable Linux, which is based on Fedora Ver4.

I am not able to boot to windows partition though everything looks perfect.

************
grub.conf
contains correct entries
************
default=0
timeout=5
splashimage=(hd0,5)/grub/splash.xpm.gz
hiddenmenu
title Enterprise (2.6.9-42.0.0.0.1.EL)
        root (hd0,5)
        kernel /vmlinuz-2.6.9-42.0.0.0.1.EL ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.9-42.0.0.0.1.EL.img
title Microsoft Windows
        rootnoverify (hd0,0)
        chainloader +1

************
/etc/fstab
shows /dev/hda1 mapped to /mnt/win (defaults or auto,users,rw options don't work)
************
[root@pc ~]# cat /etc/fstab
# This file is edited by fstab-sync - see 'man fstab-sync' for details
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /dev/shm                tmpfs   defaults        0 0
LABEL=/home             /home                   ext3    defaults        1 2
/dev/hda1               /mnt/win                vfat    auto,users,rw        0 0
none                    /proc                   proc    defaults        0 0
none                    /sys                    sysfs   defaults        0 0
/dev/hdc                /media/cdrecorder       auto    pamconsole,exec,noauto,managed 0 0
/dev/fd0                /media/floppy           auto    pamconsole,exec,noauto,managed 0 0

**********
even tried to mount manually, but failed
**********
[root@pc ~]# mount -t vfat /dev/hda1 /mnt/win
mount: /dev/hda1 already mounted or /mnt/win busy
mount: according to mtab, /dev/hda1 is already mounted on /mnt/win

**********
Tried to create my own entry. Created a directory disc and tried to mount it with /dev/hda1. disc shows no files.
**********
[root@pc ~]# mkdir diskc
[root@pc ~]# mount -t vfat /dev/hda1 ./diskc
[root@pc ~]# ls -l diskc
total 0

Please help