I have a 2015 MacBook Pro running OS X 10.11 and I originally partitioned the SSD into two - then I used the Bootcamp Assistant to install Windows 8.1 on the second partition, everything was fine for a few months.
I then made the Mac OS partition smaller and created a third partition, I didn't resize the Windows partition.
Windows 8.1 then refuses to start, I get a blue-screen-of-death with the following message:
Recovery Your PC needs to be repaired An unexpected error has occurred. Error code 0xc000000e
None of the F8 options (Safe Mode, etc) help.
I saw similar (though not identical) issues that people reported fixing using
fdisk - I went through those instructions and they didn't help.
I've made a new bootable USB stick to reinstall Windows with, the idea being once I could boot from it I could repair my installation, but the Boot Manager (Alt/Option during startup) won't let me boot from the USB stick.
I don't want to nuke the Windows partition because reinstalling all of my software takes a long time (over 4 hours).