I recently ran into a problem upgrading a computer from Windows 7 to Windows 10. I received an error message with the following error code: 0x800703ed

It turns out this system was a dual-boot Linux and Windows system. I was actually booting to a different hard drive which had GRUB installed, and then GRUB was booting to my Windows drive. I fixed the problem by switching my BIOS boot order to boot directly to the drive with Windows 7 installed and then repeated the update process. This resulted in a successful Windows 10 upgrade. After the upgrade was complete I was able to change my BIOS boot order back to the way it was before, and now everything works fine.

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