@Michaelp52
Your suggested fix worked* on my machine and t he bootloader seems to be the problem! My machine that dual boots "Manjaro Linux" and "Windows 7 64-bit" consistently fails to install Microsoft Security Update KB3033929 so
long as GRUB2 is my boot loader. Once I reconfigured the MBR and Windows' partition boot record to use the Windows 7 boot-loader the update installed without errors ^_^
*I have a dual boot setup with both operating systems in different partitions of the same HDD so instead of switching which physical drive I booted from, I had to replace my original boot-loader GRUB2 with Windows 7's bootloader:
1. Set the Windows drive to be the boot drive in the BIOS.
Replace GRUB2 code in MBR with Windows 7's "bootmgr" compatible code by running:
bootrec.exe /fixmbr
1.33 Update the partition boot record of the bootable Windows partition by running:
bootsect.exe /nt60 all /force
1.66 Make the bootable Windows partition the Active partition using:
diskpart
2. Reboot into Windows (i.e., avoiding GRUB).
3. Run Microsoft Update again and allow the install to complete along with restart. It did so without any issues.
4. Restart computer and reset BIOS to place the Ubuntu SSD first in the boot order.
Use the free EasyBCD program and edit Windows Boot Configuration Data so that Windows' "bootmgr" provides the option to boot into my linux partition as well.
5. All working normally and confirmed that KB3033929 has been installed.