STILL NOT F%@KING WORKING!!!
Issue getting latest Windows 10 Cumulative Update KB3194798 installed on Windows 10 system with Windows 7, Kali 2.0, and Ubuntu 16. Needed to remove GRUB boot loader and let Windows do the boot magic.
Ran the following in order to address:
bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
Credit to these geniuses:
http://pcsupport.about.com/od/fixtheproblem/ht/rebuild-bcd-store-windows.htm
http://www.digitalcitizen.life/command-prompt-fix-issues-your-boot-records