Windows 7 will not install on windows 8.1

I'm trying to install windows 7 Professional on a portable computer that is already running windows 8.1. I was told it would install, but whenever I run the disc, it starts the installation and begins to search for updates to the installation. Then I got a message box saying "Windows could not update the installation files. To install Windows, close the installer and restart installation. "Error code: 0 x 0.

Is there a way to solve this problem, or there at - it another way to downgrade to Windows 7?

Work through the steps for troubleshoot Windows 7 Installation failures - Windows 7 Forums Help.

You have a UEFI BIOS?  When you go to start the disc of the one-time BIOS boot menu key, you see a choice for reader DVD EFI?

Where do you have the installation media and how it was created?  Is the disc scratched or dirty.  If so, wash and dry with a soft cloth.

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