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I installed Windows 10 on a PC but it has some incompatibilities with the graphic card. Now I want to install Windows 7, so I burned the ISO on an USB stick, and then I tried to boot the system with it. Instead of launching Windows 7 installer, the computer is booting directly to Windows 10.

I read some stuff over the internet that for Windows 7 installer to be bootable, I need to set the BIOS to legacy mode. However, on ASUS EFI BIOS version 2.00.1201, I can't find this option anywhere. I selected the Boot tab and all I have is this:

Bootup NumLock State

Full Screen Logo

Wait For 'F1' If Error

Option ROM Messages

Setup Mode

Boot Option Priorities

Boot Option #1

Boot Option #2

> Hard Drive BBS Priorities

Boot Override

> SAMSUMG HD

> Windows Boot Manager

Now, where is the option of setting boot mode to legacy?

Hennes
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Gustavo Amgarten
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4 Answers4

3

In some ASUS firmwares (e.g. "Aptio"), there is no such global choice – all available boot options are merged into a single menu (press Esc to open the boot menu one-time).

BIOS-mode boot entries always describe a specific disk rather than a specific OS (since they only boot the MBR 'bootcode' and don't know the OS name, unlike UEFI-mode boot entries which do). Of course, it's not impossible that an UEFI boot entry would be named after a disk, but that's rather unlikely...

For removable media, UEFI-mode entries also have an UEFI: prefix, while BIOS-mode entries either don't (as in your case) or are prefixed with BIOS: (on some other computers).

Therefore your options are:

  • SAMSUMG HD – BIOS
  • Windows Boot Manager – UEFI (stored in NVRAM)
  • General USB Flash Disk – BIOS
  • UEFI: General USB Flash Disk – UEFI (autodetected from removable drive)
grawity
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1

If the Bios is ONLY UEFI (no legacy option), you can boot from USB if is formatted FAT32 and not NTFS. Many of new PC's/laptop's have only the newer UEFI BIOS (the Legacy Bios is an older option).

  1. Download Rufus (freeware, please use the at least the current latest version 3.8)
  2. Make a bootable USB flash drive, formatted in FAT32 (!)
  3. Put in the PC's, Laptop's USB port.
  4. Power on the PC/Laptop and push the ESC (can be F8, F10, etc.. depending on the PC) until you get into the boot selection section.
  5. Boot from the USB.
  6. Enjoy installing Windows!
zx485
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István Sas-Kovács
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0

There's another incompatibility: IF your System calls for bootx64.efi you will only be capable of install Windows 10 and above. Older OSs use bootia32.efi instead. Newer Systems don't call for bootia32.efi anymore. .efi files are located in your install media, in the \efi\boot folder.

Rassuir
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0

I need to set the BIOS to legacy mode. However, on ASUS EFI BIOS version 2.00.1201, I can't find this option anywhere.

Now, where is the option of setting boot mode to legacy?

I ran into one case where I couldn't find this option in ASUS Setup Utility either, and had to explicitly search for it in order to access it:

https://superuser.com/a/1898799/36197

Andreas
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