I was dual booting Windows 10 and Ubuntu.
I installed Remix OS (Android on desktop) so I could triple boot. Remix OS started boot-looping and I couldn't unistall it due to corrupted files so I just deleted it.
The next time I switched on my machine I got a screen from Windows Boot Manager saying Windows has been disabled to boot. To restore insert installation cd etc. I don't have an installation CD, so what should I do?