I have Windows 8 pre-installed and then installed Grub with Ubuntu. Ubuntu is not my thing so now I want to remove it along with grub. From what I have learned, with UEFI, Grub does not overwrite the windows bootloader in the EFI partition and is stored elsewhere. How would I remove grub and make my PC use the Windows bootloader instead? It should be noted that I created a seperate /boot partition when installing Ubuntu.
To do so you will need a windows installation cd/dvd
1: put it in your optical drive and boot from it
2: on the installation screen where it asks you to install windows, click on "Repair Your Computer" on the lower left corner of your screen
3: Now go to command prompt(It probably will show a window saying "Trying to repair windows automatically", close it) and type bootrec/fixmbr
4: after it finishes GRUB is gone and you can now boot into windows directly
5: you have a ubuntu partition left in your computer, that doesn't show in "My Computer", to access that, right click on "My Computer" and Select "Manage" and go to "Disk Management"
6: Select the ubuntu partition and format it to a file system that windows can use.
With UEFI you have both a Windows folder & an Ubuntu folder in the efi partition. the UEFI reads the efi entries and adds them to its own NVRAM to remember them. You have to remove ubuntu folder from efi partition first or UEFI will re-add it. Then you have to remove UEFI entry from UEFI.
You should have these folders in the efi partition. Delete only the ubuntu folder. Live installer should show folders. And if only Windows you have to mount from inside Windows the efi partition as it is not normally mounted.
You should not have to install Ubuntu but can use live installer DVD or flash drive. Some UEFI systems may let you do the UEFI edit from UEFI menu.
from liveDVD or flash and use efibootmgr
The "-v" option displays all the entries so you can confirm you're deleting the right one, and then you use the combination of "-b ####" (to specify the entry) and "-B" (to delete it). Examples #5 is delete:
If All Else Fails!
The guy above me's method does not work on newer EFI computers. I solved the problem. Here is how I did it. WARNING, you have to reinstall Linux / grub first!
Steps: (this is if nothing else works and takes a long time)
1: Reinstall Ubuntu / Linux mint (this is just so you can use GRUB to boot into Windows).
1.5: Restart and boot into windows (if you can't boot to Windows, then live boot from the CD or USB and run the following in a console:
Boot repair (if needed right now)
1g: Select recommended repair and follow the on screen instructions.
2g: After your done, reboot. You should see the grub menu, even though you can boot to Windows from here, this is not what we want yet... But find the option that boots into Windows.
2: Once your booted into Windows, run your disk partition editor and delete All partitions related to Linux / grub. Especially make sure the small grub partition is removed. Reboot
2.5: Make sure the windows loader is the first selected boot device. (most likely is). Disable the Ubuntu option. Continue boot.
3: If you've done everything right up to this point you should see (depending on your computer) your splash screen for a second and then it will turn into an error screen saying that there was an error with the boot. ("Winload.exe is missing or corrupted" most likly).
3.5: Don't be alarmed (I was). The next step will restore your original bootloader.
4: Restart and boot to your Linux CD or USB.
5: Once booted, run boot repair commands from above again. This time when running it. It will act differently, there is no grub bootloader detected to reinstall and should run faster than before.
6: Once complete, restart.
7: Enjoy your GRUB free system!
This worked for me when nothing else did, I ran bootrec.exe. Nothing worked. This saved my computers life. Hope it saves yours!
You can restore the Windows bootloader with a Windows 8/8.1 DVD. These instructions are inspired by Manindra Mehra's answer, but I expanded it with full working details (verified with a Windows 8.1 DVD).
This leaves the Ubuntu partition on your hard drive or SSD. To remove it: