i need some help please... im a noob of course

[hate_machine420]

i installed gentoo on my spare harddrive, i used grub as my boot loader, and i have windows xp too, so i wanted to dual boot them, my question is how do i get off of the live cd and onto my system where the /boot/grub/grub.conf file is so i can edit it agian, when it boots up the grub splash screen comes up, and only shows xp, xp doesnt boot either, and when i try to mount something from the live cd is says file not found, or something like not found in /etc/fstab or /etc/mtab im guessing because its looking at the cd and not my harddrive?

[hate_machine420]

Code:
# mkdir /mnt/gentoo <-- create a mountpoint for your / filesystem
# mount /dev/hda3 /mnt/gentoo <-- attach your root partition (substitute hda3)
# mount /dev/hda1 /mnt/gentoo/boot <-- attach your boot partition (substitute hda1)
# mount -o bind /proc /mnt/gentoo/proc <-- since you never know when something might need it
#swapon /dev/hda2
#chroot /mnt/gentoo /bin/bash