Recover windows MBR using ubuntu live CD
If you want to restore Windows Bootloader and for some reason cannot use the windows installation cd, there is a simple way to do it:
NOTE: make sure you have internet working.
1) Boot with Ubuntu Live CD or Linux Mint Live CD
2) On the terminal:
sudo apt-get install ms-sys
then
ms-sys –mbr /dev/hdX
NOTE: in my case the main windows xp system is located in hda1 so I used ms-sys –mbr /dev/hda
3) Reboot.
This should get your windows back.
Credits:This post is orginally posted by inoxllor in ubuntu forums on this page
http://ubuntuforums.org/showthread.php?t=622828
http://ubuntuforums.org/showthread.php?t=622828