I know my questions looks similar to others, but they have not been answered as to solve my problem. I'm from Mexico. I got an ASUS S451L. I got the computer with windows 8 then I upgraded it with windows 10. A week ago I got a virus and lost all my data, so I decided to install Ubuntu 16.04, because I read good reviews about it. I was very excited, but after I installed. I tried to get my favorites videogames (LoL;GuildofWars2) running but they wouldn't work on Linux. Yes, I installed Wine and play on Linux. I had to installed Ubuntu again because after trying to install GW2, it crashed.

I got tired and decided to go back to windows. Unfortunately, I never backed up windows; I was afraid I deleted forever, so people told me to buy a new license or get it pirate. But somehow , reading forum, I got to know if I still had the ISO. the only problem was that I couldn't boot it. GRUB would get on the way. Anyways, I repaired the boot loader using that Ubuntu application Boot-repair. I got to the command thing where I can type bootrec /Fixboot or /Fixmbr. It told me that the processes were succesful. But it was still booting GRUB. I prioritize Windows Boot manager (yes , it gave me theoption) but it wouldn't boot it. I uninstalled UBUNTU hoping it would stop booting GRUB, but it was still booting (in a blackscreen with inframes thing). In conclusion, it is not booting windows and evennthough I got a Windows 8.1 PRO iso, it sends me an error of compatibility:

"The computer started using Windows Installation media. Remove the installation media and restart your computer so that Windows starts normally. Then, insert the installation media and restart the upgrade. [DO not select !custom [advanced] to perform an upgrade. !custom advance installs a new copy of Windows and deletes your programs and settings/" I read something that said this happened because it read the booter my computer has as default. I have my key license. I just need to boot Windows 8 so I can install it. Is it possible? What could I do? Am I doomed? Will Yuri ever marry Victor? HELP ME !!

Greetings !

P.S. sorry for the long post. P.S.2 I don't know anything about programming or those things in case you didn't notice. P.S.3 I tried the DISKPART thing but it didn't do anything when I typed the coomand "ren bcd bcd.bak".

  • Boot on Ubuntu and erase your entire hard drive by writing sudo shred -n 1 -v /dev/sda in a terminal. Make sure you have backups as this will completely nuke your HDD. Once that's done you can reboot on your Windows disc. – André Borie Nov 27 '16 at 11:13

Are you sure, your system uses MBR? May be it's GPT?

In Ubuntu as SU check following path: /boot/efi(something like sudo ls /boot/efi/), if it's non-empty, you are, probably, using EFI bootloader.

Way 1: Check out sizes of /boot/efi/EFI/BOOT/BOOTx64.efi and /boot/efi/EFI/grub/grubx64.efi (don't sure about directory, it can be ubuntu, or just linux), if they match -- your system uses fallback bootloader, which is set to GRUB.

From same /boot/efi/EFI folder copy Microsoft/Boot/bootmgfw.efi to BOOT/bootx64.efi replacing it (better make a backup first).

Now your system should boot with Windows bootloader.

Way 2: As su run efibootmgr, if it's not found -- you, probably, are not using EFI. Elsewise it will print current bootloader, boot order and your registered EFI bootloaders. Check out man efibootmgr to set up your bootorder in preferred way.

  • Thank you for your reply @Pavlus . I don't know much about computer. I didn't understand well "In Ubuntu as SU", but I types "su" in the terminal and it is asking me for a password. I don't know what password is asking me to write S: I don't know what MBR or GPT is, but when I did the "fixmbr" thing in the command (blackscreen) it says that the fix was successful. This could mean that my system uses MBR? – Ayrton Lieblos Nov 27 '16 at 23:40
  • No, it doesn't mean anything. If you don't know your Super User password -- use a prefix sudo before a command needed to be executed as Super User, it will ask you your current user's password (su starts a shell with admin privileges, where you can type commands, but sudo executes single command as admin and asks current user password instead of admin password). – Pavlus Nov 28 '16 at 10:30

If you can, reinstall ubuntu, don't overwrite the entire disk, (if your windows 8 partition is still there you'll be ok) then take the steps to make Windows 8 your default bootloader (see How to make Windows bootloader the default?)

Then you can remove Ubuntu's partition if you'd like.

  • EasyBCD is a fairly uncomplicated way of fixing the issue if you manage to get your setup for dual-booting back up again, you should be able to get right back into Windows and fix your setup there. You can if you'd like keep dual-booting with the Windows bootloader where Linux is secondary. If you can't log back into Windows with your dual-booting setup, you may need to look up more in-depth ways to restore the master boot record while you're in Ubuntu (like in the other post) – TheUnknownGeek Dec 2 '16 at 13:58

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