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I want to convert GPT to MBR, here's the reason why:

Recently, I had Windows 8.1, I was thinking to download the .ISO file from Official Microsoft website and reinstall Windows 8.1, and I did. I booted the USB and saw that my laptop (Lenovo B590) was ignoring it, it was just booting to Windows.

I just realized that my disk was GPT, not MBR, and that's the problem. Ubuntu was installed fine, but Windows didn't. I formatted my C:/ drive, just to check if anything works. Nothing did. When I formatted my C:/ drive, I had no OS. And I always got the "Your PC needs to be repaired" notification when I turned my PC on. So I just installed Ubuntu so I can fix the problem.

Please give me detailed answers, I want to convert my GPT disk to MBR.

Back to the story, I realized that I can't install any Windows.

Please, I really need answers about the following:

  1. Can I install Windows 8.1 on GPT, if yes then how?
  2. If the above question's answer is "no", then how can I convert my GPT disk to MBR, in able to install Windows?

Update: My boot order is correct. I booted the USB with Rufus, my USB is 32GB.

Chan Ching
  • 21

1 Answers1

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The solution worked for me. I realized that the ISO file had the problem.

Downloading the Windows 8.1 ISO file again did the trick!

Here's what you need to do:

  1. Boot your USB with Rufus (correct settings)

  2. Run 'setup.exe' located in your USB's storage when its booted.

  3. If setup.exe runs without errors, then the USB is fine. If it does have a error like "xx.file is corrupted, missing or in unknown format" then it's the ISO that's creating the mess. Downloading a new ISO file from the official site will fix it.
  4. If setup.exe runs without errors and you are still unable to boot, try changing the BIOS mode to UEFI, turning off Safe Boot and / or quick boot.
Chan Ching
  • 21