I am trying to reformat my pc but I get an error saying:

daniel2754

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"The computer started using Windows Installation media. Remove the installation media and restart your computer so that Windows starts normally. Then, insert the installation media and restart the upgrade. [DO not select !custom [advanced] to perform an upgrade. !custom advance installs a new copy of Windows and deletes your programs and settings"
What is wrong with my pc? I have reformatted a number of times but this is the first time I have ever encountered this error?

I have tried to repair my pc but it ends up saying "unable to reset your pc. a required drive partition is missing."

I have no idea what of what is going on. Please help?

Note: I am not really familiar with computers and I am a noob. Please be gentle!
 

My Computer

System One

  • OS
    windows 8.1
You need to select the option "Custom: Install Windows only (advanced)".

"The computer started using Windows Installation media. Remove the installation media and restart your computer so that Windows starts normally. Then, insert the installation media and restart the upgrade. [DO not select !custom [advanced] to perform an upgrade. !custom advance installs a new copy of Windows and deletes your programs and settings"

Which type of installation do you want 1.png

Which type of installation do you want 2.png

How to download and clean install Windows 8.1 if you have an OEM computer with UEFI firmware (BIOS) embedded Windows 8/8.1 product key. -> link
 

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    System Manufacturer/Model
    Lenovo G580
    CPU
    Intel Core i5-3230M
    Memory
    8 GB
    Graphics Card(s)
    Intel HD Graphics 4000
    Browser
    Microsoft Edge
    Antivirus
    Windows Defender, standard user account
    Other Info
    UEFI firmware (BIOS) embedded Windows 8 product key.
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