How to uninstall / remove Grub Bootloader without losing any data from Windows 8, 8.1 and Developer preview OS [Without formatting] [Android on PC uninstall] [Linux on PC uninstall]

Using Recovery options: 

• Create a recovery drive, make a bootable pendrive from there
• Search " advanced startup" in start menu [Win technical preview] or start screen [Win 8 8.1]
• After rebooting and entering boot, select Troubleshoot option
• Select Advanced options
• Select "Re - install Windows from this media" option.
• This method is most probably unsuccessfull but you can give it a try.

Using CMD in Advanced Startup :

• Search " advanced startup" in start menu [Win technical preview] or start screen [Win 8 8.1]
• After rebooting and entering boot, select Troubleshoot option
• Select Advanced options
• Select Command prompt 
• Enter the following commands one by one:

           Bootrec.exe /fixboot

           Bootrec.exe /fixmbr

• The CMD method is most succesfull and the quickest of all the others.