Sometimes
Dual OS installation corrupt your boot loader and you want to load previous
boot loader.
For example
you install Windows 8 and uninstall it but still you are having trouble with
boot loader and want to go back to Windows 7 boot loader.
The easy
way is to boot from the DVD and use Startup Repair.
Go into the command prompt after booting from the DVD, and use
these commands:
bootrec
/fixmbr
bootrec
/fixboot
bootsect
/nt60 all
Of course
you have to be careful when trying to replace the bootloader, as it can result
in a failure to boot.
