“If you’re unable to get it running again and have to reinstall, make yourself a Linux Live USB stick.(Ubuntu, Kubuntu, etc) Boot up the PC with it and you should be able to browse and save your files, My Documents etc. Save all of them before you wipe windows.”
Absolutely! One of the best reasons to have a Linux stick handy even if you use windows!
Many of the Windows/boot repair disks/sticks run Linux/Ubuntu simply because you can boot to a complete operating system from a USB or CD.
https://search.brave.com/search?q=linux+live+usb+repair+tools+to+fix+windows
This one looks decent; https://trinityhome.org/