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/
Yep, everyone should have one ready. The job of Linux is to save you from Windows. :)