I installed Grub from the below link onto a USB and It was able to see the OS and it booted normally after selecting it from the Grub menu.
HDD bootup is enabled from BIOS.
Boot partition is inactive. This can be done from Diskpart in CMD while logged in. But do not reboot without the USB being ready with Grub on it. It will show that operating system is missing at which point you can continue to booting to the O/S from the USB Grub menu.
So now system only boots if the USB is flash disk is plugged in and I choose the boot for windows.
The link for the Grub I installed for this project is.
https://sourceforge.net/projects/supergrub2/
It works only when the Generic MBR is installed from the Boot-Repair-Disk. SO after booting into Boot-repair disk just run a repair and it will install the needed files for this solution to work then exit the program.
Download Boot-Repair-Disk from
https://sourceforge.net/p/boot-repair-cd/home/Home/
You can also use the boot repair disk to get it back to working normally. Then the Win O/S will go back to booting normally. So if you can't get this solution working then just boot from boot repair disk and do a repair and restart the system and Windows will load normally again.
Use Rufus to create the 2 USB flash disk for the Grub menu and the Boot repair disk. It sometimes needs to connect to the internet to add needed files.
Link is:
https://rufus.ie/
Important notice!
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