boot loader fixing while dual boot

1. Boot with Ubuntu Live CD
2. Open a terminal
3. Type sudo grub
it will chage prompt into grub>
4. type find /boot/grub/stage1
5. Type root (hd0,?) [replace the ? with whatever find /boot/grub/stage1 gives you]
6. type setup (hd0)
7. Type quit
8. Restart and grub will magically re-appear