The Windows Bootloader is a Steaming Pile
...of llama excrement. I have never before worked with such an insanely idiotic, badly designed, horribly broken, desperately fragile piece of software, and I've worked with LILO before.
Pray to whatever god(s) you worship if your root disk starts throwing SMART errors signaling it's taking a turn for the worse, because when you get to work actually swapping disks out, you're signing up for a road trip through a valley of insanity populated by insane Microsoft Windows developers and guarded by their demented friends in the marketing department.
Only Microsoft could devise such a devilishly incompetent boot loader mechanism, one so brittle that its own tools, designed to repair the miserable thing, mind you, routinely have to reboot the affected system several times before getting things "right." Only Microsoft could develop and sell an operating system whose boot loader, so very trivial to break even on a good day, can somehow convince it that a fully licensed installation is actually pirated.
... my Ubuntu installation remains unharmed ...
Rant completed. Carry on.