Problems with Formatting to Windows 8

[ChristianCEI]

I have a clients laptop, that had a BCD Problem. As they had no important information on the laptop, they requested a format and re-installation of WIndows 8.

I had extreme trouble with formatting, and eventually installed windows 10(oops, my mistake). Now I can't format it again back to Windows 8. It says: A media driver your computer needs is missing. This could be a DVD, USB or Hard disk driver. If you have a CD, DVD, or USB flash drive with the driver on it, please insert it now.

Now the windows 8 USB drive is in, and it read it to load setup, but now it gives me this error. How do I Proceed with the installation?
PS: the windows 8 Pen Drive is created with RUFUS, MBT as Bios and UEFI. I tried GPT but gave the same error.
It does recognise the stick in BIOS as a bootable drive.

Thank you.

 

[Sedivy]

I don't think you needed a full reinstall as when you're having a bcd issue, usually inserting an install disk then running a repair to fix the bcd seems to be enough:
https://answers.microsoft.com/en-us/windows/forum/windows_8-system/how-do-i-repair-windows-8-bootbcd-error/78d118bf-bc47-4e43-b3fc-5e1fac6a378e

However, if you're having compatibility issues now with your boot media, I recommend you create it like this from a command prompt:
https://betanews.com/2013/11/06/how-to-create-a-bootable-windows-8-1-usb-drive/

I've never had any issues with this method, and all windows machines no matter the version of windows or if it's a bit older machine, seem to recognize it just fine.