Hi and thanks for reaching out. My name is William. I'm a Windows technical expert. I'll be happy to help you out today.
You can reinstall the Windows 10 operation system by creating Windows 10 boot media. To create Windows 10 installation boot media, you will need a USB drive with at least 8 GB free space. See this Microsoft article: https://www.microsoft.com/en-us/software-downlo...
When it completes, you can either run the setup.exe file directly from the USB drive or boot from the USB drive by changing the boot order in the BIOS so that the computer starts by booting from USB.
Note, when you get the product key page, just skip this. Windows 10 will automatically activate when it is online.