Boot failuer when trying to reinstall grub



Hello,
I was using RH9 and Win Xp. I reinstalled windows, and grub got wiped
out.
Now I am trying to reinstall grub by putting the RH 9 bootable CD.
Boot prompt comes

boot: linux rescue

It shows the following errors


EXT3-FS: unable to read superblock
.....
.....

Kernel panic, try using init=

Kindly suggest
Thanks
Raj
.