[SOLVED] Disable UEFI, EFI from preinstalled Windows 8 computer

First of all: UEFI is not such a bad invention really, and yes there are ways to disable it.

The solution is pretty simple after understanding what UEFI is good for. Anyone (like me) who start their search for a solution thinking "this must be some new evil invention from Microsoft to prevent people to use their computer with other OS than Windows" will have a hard time finding the solution. But its there and its obvious.

UEFI as I understand it:
UEFI is a way to prevent users that dont have access to the installed OS (Windows) to access data in the system. This means that if you cannot login to Windows you should not be able to boot or install another operating system. But it allso means that if you are logged in as administrator to Windows you are allowed to "remove UEFI"; this means enable access to BIOS. After enabling BIOS you can disable UEFI in BIOS, but to make sure there is some security left you should first create an administrator password in BIOS. In my BIOS this is not optional, to be able to disable UEFI I first must create an administrator password.

Do the following in this absolute order
1. Start windows and login with administrator privileges.
2. Disable UEFI in Windows (description below).
- Move the mouse pointer to the bottom right corner and click Settings.
- Hold -Shift- and click reboot to enter settings before reboot.
- Click "Troubleshoot" > "Advanced settings" > "UEFI firmware settings"
- Click the button "Reboot"
3. Reboot into BIOS and set an administrator password.
4. Disable UEFI in BIOS (Find security settings and disable "Secure boot")

Optional: Install Ubuntu with dual boot
5. Create empty space on hard drive by shrinking another partition from windows before installing Ubuntu.
6. Install Ubuntu 12.10 amd64 in the empty space or empty partition, if not sure, create a new partition with windows first.

7. For dual boot: If you want dual boot with Windows and want Grub to do it for you, you should install ubuntu 12.10 64-bit. Its named amd 64 by tradition but it is allso made for intel i3 and other modern intel 64 bit processors.

8. After installing ubuntu 12.04 you must repair bootloader this way:
Boot-Repair - help.ubuntu.com
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair

9. Now your bootloader will show Windows

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