RECOVERING FEDORA AFTER WINDOWS XP

[shailesh]

i have installed windows xp over fedora 15. How do I recover the fedora bootloader now?
in running fdisk -l it displays
/dev/sda1 ..... ..... ntfs
/dev/sda2 ..... ..... ntfs
/dev/sda3 ..... .....ntfs
/dev/sda4 ..... ..... ntfs
/dev/sda5 ..... ..... ntfs
/dev/sda6 ..... ..... swap
/dev/sda7 ..... ..... linux

I tried chroot /mnt/sysimage
        
grub-install /dev/sda7
         Ctrl+D
(twice)
But its not booting. The boot menu appears but error is displayed regarding unable to
mount device