Sorry for the delay in reply. I've been offline.
To perform a clean install, you will need an installation media.
You will need to use an installation media. If you don't have one, create one using the Media Creation Tool.
You can create the installation media on an empty USB flash drive with at least 8GB.
Below are instructions for creating installation media on a USB flash drive.
- Access the link below and click "Download tool now";
https://www.microsoft.com/software-download/win...
- Double-click on the downloaded file to run the tool;
- If prompted by UAC (User Account Control), click on "Yes";
- Read the terms and click "Accept" if you agree;
- Select "Create installation media (USB flash drive, DVD, or ISO file) for another PC" and click "Next";
- Uncheck the "Use the recommended options for this PC" box. Then, select the Language, Edition, and Architecture you want, and click "Next".
(Most computers use the "64-bit (x64)" Architecture.)
- Select "USB flash drive" and click "Next".
- Connect the USB flash drive you want to use, click the "Refresh drive list" link, select the USB flash drive, and click "Next";
(Note that the files on the USB flash drive will be deleted. Make a backup of the files if necessary.)
- Wait for the procedure to finish and click "Finish" when the USB flash drive is ready.
If necessary, make a copy of your files to an external storage device or a cloud storage service. A clean install will remove all data stored on the system drive.
Then, access the article below, go to the end of the article, and expand "Clean install" under "Steps to reinstall Windows with media" to see the instructions.
https://support.microsoft.com/en-us/windows/rei...
In your case, start the computer using the installation media and proceed from step 2.
(You may need to change the BOOT property in the device's BIOS settings. If you don't know how to do this, please tell me the motherboard model.)
Feel free to ask back any questions. Click on the "Reply" button below my reply.