Thank you [USER=35245]xrobwx71[/USER].
First method I watched carefully and it is last resort. Installation of Windows 10, using Custom option will install Windows 10 and create Windows.old folder with my files, but apps needs to be reinstalled as far as I know. That requires a lot of time.
Regarding second option. I have Windows 11, on Disk 0, with boot partition C:\Windows and it boots correctly. I have dual boot system and my Windows 10 is on Disk 2, partition I:\Windows. I manually created EFI partitions on both disk, using BCDedit commands and giving them necessary IDs. Disk 1 is used for apps installed with Windows 11, all apps for Windows 10 are on the same Disk 2, no additional partitions, just one for Windows 10 and for all installed apps.
Windows 11 boots all right, but Windows 10 start booting, I have Windows logo, spinning circles, no errors and when it comes to login screen, it does not show up, it stays on black screen where I have cursor I can move around. Is it bootrec problem, since I tried to fix it using USB installation media, open CMD and tried several DISM and SFC commands which showed me error that Component store is corrupted and it is reparable? How to repair Component stote to make Windows 10 boot again? I uploaded dism log file after I saw this error about Component Store corrupted and reparable, but I do not know how.
Both disks are now GPT and should boot in UEFI mode. How can I repair my Windows 10 Pro to boot again? It booted correctly when it was in MBR, Legacy mode, but after I converted it to GPT as I did for Windows 11 which continue to boot all right, I cannot boot Windows 10 in GPT UEFI mode. Changing BIOS for Legacy mode, does not change anything, Windows 10 stays un-bootable. Do you have some instructions how to make it boot again in GPT UEFI mode, please?
I can boot with USB installation media, with Windows 10 version completely same as I have.
