In order to fully re-install Windows 10, you will need to use a Windows 10 installation media. You can choose between a bootable DVD or bootable USB drive. There is a way to create either one for free, but you will need to use another working computer with Internet access. If you don't have one, please ask your friend or a family member to help you create a Windows 10 installation media.
Here are the instructions:
1. Use any working computer with Internet access, and open a web browser and go to this web address:
2. There click on the Download tool now button. It will then prompt you to download a file named MediaCreationTool. It is used to download the Windows 10 image file required for creating an installation media
3. Run the downloaded tool and select the Create installation media for another PC option and click Next. Un-check the check-box at the bottom and select the same Windows 10 version that is installed on your computer or the one you want to re-install, and click Next. "Windows 10" refers to the Windows 10 Home edition, and "Windows 10 Pro" refers to the Windows 10 Professional edition
4. You will then be able to choose between creating a bootable DVD (ISO file) or a bootable USB flash drive. Select the desired option and continue with the instructions
Once you have a Windows 10 installation media, use it on your computer to re-install Windows 10.
For further assistance, let me know.