Recovering Linux installation after windows install
Since window does not detect GRUB, if you wanna add a windows installation later or recover your existing installation, you end up invariably losing your linux installation.
To recover it, insert the installation disk, enter the text based recovery, when the console opens up type chroot /mnt/sysimage This is where your system is mounted on the recovery console. Then, grub-install hd like, hd0,hd1 etc. And reboot.