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Thank you for these clear instructions. One question before proceeding: why couldn't I do this using my Windows 8.1 DVD running set up from within Windows 10? Wouldn't 8.1 give any option to format C: for installing 8.1Vieux,
We are going in circles. Take a deep breath. Then read this.
1. Go back to you mismatched Win 8.1.
2. Use this link and create installation media for Windows 8.1
http://windows.microsoft.com/en-CA/windows-8/create-reset-refresh-media
Please read the whole page so you know what to do.
3. Insert a DVD or a USB, then click the Create Media button.
You will be ask to choose ..................................
Language , select English (United States ),
Edition ( Win 8.1 version, Home or Pro ), make sure you take the same version you started with.
and bit version ( 32-bit or 64-bit ), also make sure you take the same bit version you started with.
click Next
select either USB drive or ISO file ( read what it says about ISO file option )
click Next
then follow the instructions to finish.
After you've created the installation media, do one of the following to install Windows 8.1:
- Connect the USB flash drive to the PC where you want to install Windows 8.1, browse to it in File Explorer, and then open the setup.exe file. Follow the instructions in setup.
- If your PC is set up to boot from a USB drive, connect the USB flash drive to the PC where you want to install Windows 8.1, restart (reboot) it, and then follow the instructions in setup.
- If your PC is set up boot from the DVD drive, insert the DVD into your PC, restart (reboot) it, and then follow the instructions in setup.
Also as I do not now seem to be able to access BIOS, thanks to the Windows 10 media installation, how can I tell what my PC is set up to boot from? Currently it doesn't seem to want to boot from the W10 Recovery USB key I recently created.