I did too, I had installed with 2 drives, Windows first, then Kinoite, but the problem was that Windows automatically put its bootloader on drive 1 even if the OS was installed to drive 2, so when I installed Kinoite on disk 1, it naturally wiped everything that was on there.
My stupid easy solution was to reinstall Windows on drive 2 again, but with drive 1 disconnected from the PC at installation time, so it couldn’t mess up, other answers here might be more refined (no pun intended) though, if you prefer/need to salvage the Windows system and can’t just delete it.
Mine actually wasn’t that easy either, because the drive was ButLocker encrypted, so before I could proceed to destroy everything, to save my files, I also needed to boot from Linux, mount the drive, decrypt with the BitLocker key and copy over the files to drive 2