How to uninstall Ubuntu without breaking the bootloader?

Question

ubuntu

several sections. at startup select system.
if I just format the partition with the bubunta, then the seven will boot normally? Or do I need to fix the bootloader

Answer 1

Started from usb of any windows, pressed shift + f10, wrote bootrec / FixBoot there, rebooted. WHAT'S HARD EPT???

Answer 2

along with ubuntu, the bootloader will also die.
unless, of course, you did not select /boot as a separate file system.