Windows 10: Windows 11 update - can't boot on a dual drive custom build

Dear fellas, upgrading to Windows 11 can be a serious problem when done without thought. Some background: I'm running a rather old custom build desktop pc, about 5yrs old, with a mobo i5-11500 replaced recently, a samsung 128gb ssd and toshiba 1tb hd. We were doing fine on win10 until I decided to give win11 a try just now. Shouldn't be a problem, I thought. Just roll back if there is a problem, I thought.After installing interminably, restarted my good ol pc and it says "reboot and select proper boot device."Since then, I've regretted there not being time travel soooo much. 1 tried checking

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Dual Booting with Windows 8.1


The procedure below will allow you to boot Windows separately or in dual boot configuration.
Here's what I recommend to do:

1. Disconnect the drive containing Windows 8.1
2. Install Windows 10 with one drive connected.
3. After step 2, reconnect the drive containing Windows 8.1
4. Boot up Windows 8.1. Open disk management and take a note of the drive letter of Windows 10 OS.
   NOTE: if you boot up Windows 10, then take a note of Windows 8.1 drive letter
5. Open Admin command prompt and type: bcdboot X:\windows where X: is the drive letter of Windows 10 (Windows 8.1 if you boot from Windows 10 in step 4)
6. Reboot the PC. You should have a dual boot screen.

NOTE: To break off the dual boot setting, Win+R->msconfig->boot and delete the none default entry on the list.

 

windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx

 

Dual Booting 2 x Windows 10 OS Drives (Existing Installs)


It is uneccessary to do all of the above.

1. Boot up Windows 10
2. Open Disk Management and take a note of the drive letter of the other Windows 10
3. Open Admin Command Prompt and type: bcdboot X:\Windows where X is the drive letter noted in step 2
4. Reboot, you should have a dual boot menu.