At least the parts of the bootloader that I could get to are gone, I deleted the recover partition at the start of the disk (it was sda1 when I looked at it) and the larger one at the end (it was sda7). Then I moved the Microsoft directory away from EFI/Microsoft so it can't be found. I'm not sure what piece of the BIOS or the UEFI system is still pointing at this bootloader, but I'd like it to point somewhere else