How to retrieve a Windows Vista / 7 / 8 boot with GRUB (Grand Unified Bootloader) defective

When we have a computer with 2 operating systems installed (Windows + Linux) with a multi-boot manager GRUB, we can present problems to remove linux and just stay with windows.

To resolve this problem follow these steps:

1- Insert the installation CD of the operating system installed on your computer

2- Press F12 to select the CD Rom as first boot device

3- Press any key on the menu says "press any key to boot from cd or dvd" to enter the installation CD/DVD

4- From the CD select Repair your computer

5- Click next on the language selection screen

6- Locate the option of entering the command line and press ENTER

7- Write in the command line :
                                                 a) bootrec /FixMbr
                                                 b) bootrec /FixBoot
                                                 c) bootrec /RebuildBcd
8- Restart the computer

9- Press F12 to select the CD Rom as first boot device

10-  From the CD select Repair your computer

11-  Locate the option  Automatic repair /  Startup repair  and press ENTER

12- Restart the computer

Note that the location of the command line and startup repair can vary depending on whether you use Windows Vista, 7 or 8.


EXAMPLE

WIndows 8.1 Pro    

For command line option: 

For automatic / startup repair option:

Now your computer will boot into windows automatically