Windows 10: how to fix 0xc00007b windows boot manager

i followed all the steps but the startup repair doesnt work in advanced options so i need help

:)

 

Windows boot manager

There could be some system conflict triggered after the said changes. To help you with your concern, we suggest that you perform a clean boot. A
clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This will help to determine what is causing the issue on the Windows boot manager. To do this, click on this
link and scroll down to the
How to determine what is causing the problem by performing a clean boot section then follow the steps listed..

Note: If the installation is successful and the issue has been resolved. Please go through the section “How to reset the computer to start as usual” to reset your computer to the normal startup.

Let us know how it goes after performing the suggested steps.

 

Partition management

Or at the very least, make sure that your hard drive boot order is correct, because it will take the first writable drive in the boot list to determine where to put the boot loader. As Jester suggested, pop the Windows install disk in, make sure your boot order is correct (or unplug the drive,) and run repair. It's really that simple.

 

Quad booting

I would use Grub if I were you to.manage the OS boot list rather than Windows boot manager. I've had much better luck over the years that way...more stable, easier to fix, easy to modify.