Recover grub

Once you install a windows OS in a system which is already having a Fedora on another partition you will not be able to access the Grub and you cannot boot Linux anymore.

The solution for this problem is to boot with fedora cd1 and at the boot prompt enter “linux rescue”.

Once booted run:
chroot /mnt/sysimage
/sbin/grub-install /dev/hda

This should put grub back on the mbr.