Windows 10: Can't Boot Into default Windows Partition

I have not been able to boot into the Windows 10 default partition for some time. I am running Windows 10 Home. Version 20H2, OS Build 19042.746.
When I attempt to boot normally the windows boot manager comes up and says that windows cannot boot. I have two partitions on my computer and I made the one that I cannot boot into, so I could slowly migrate programs from my old partition to the new one, since I was having many issues with the old partition when Windows Update ran.
When the Windows Boot Manager comes up, the only way I can get into either partition is to choose the F1 option and "choose another operating system", at which time I can only choose the old partition which is not the default partition.
My hard drive is set as the default boot device in the bios.
I have tried to install Windows 10 pro, to no avail, since it has to reboot many times and there is the issue of not being able to boot normally.
I have tried all the other options offered by the Windows Boot manager, such as "repair startup errors, uninstall updates, choose restore points, command prompt commands such as check disk, repair mbr, rebuild bcd, etc.
Any suggestions would be appreciated. Thanks!

:)

 

W7 Hard drive partition issue

to get rid of that 100 meg windows partition that setup creates for you on a new install on a blank hdd:

- press shift+f10 when on the partition management screen in setup <-- this opens a command prompt
- diskpart <-- start the windows command line partition management tool
- list disk <--- list the installed hdds in this computer for the next step
- select disk 0 <- might have to replace 0 with the number of the correct disk
- clean <-- this will erase all data on the disk you selected one step up- dont use the wrong disk!
- create partition primary <- creates a primary partition taking up all space on the drive, adjust the command if necessary
- exit, exit to exit diskpart and the command prompt
- click refresh in partition manager and select your newly created partition and install to that

 

How to go about building a tri-boot system?

i dual boot all the time, and going in to tri boot is easy.

step 1) partition the drive in to 3 partitions ( leaving 1 empty for the linux installer. )
step 2) install windows on the first 2 partitions.
step 3) install linux, and let it auto partition the remaining space. ( i recommend at least 30gb of space for linux, because it will make things a lot easier. )

step 4) enjoy.

 

Boot windows installation within a partition?

Damnit, I knew thats what you wanted with your first post! I deleted my post because JMCSLOB confused me lol.


Hm, if you Follow this guide (Replace words "flash driive" with 160GB hard drive) How to Create a Bootable Windows 7 or Vista USB Drive for both partitions and then to do a dummy install of windows 8 on the last part of the HDD it should give you the option to boot Windows 7/8 Installer or boot into windows 8.
Edit: On step 4 you will want to make sure you size the partition correctly... or you can use the windows gui tool in control panel.


Once you get that far you can just delete windows 8 from the boot menu using MSCONFIG and delete the partition.