I pull out my Windows 10 USB install stick, boot that and do a clean install.

1. How to clean install Windows 10 (and other versions) is all over the web.
2. The creation of said USB stick is free and the google terms I use to find the FREE Microsoft tool are "Microsoft Media Creation Tool Windows 10."

3. After the clean install I have to head to the laptop maker's site for drivers and apps specific for this laptop.