Please create a Windows 11 USB setup disk using the Media Creation Tool. You'll need a USB stick of 8GB or higher capacity to create a USB setup disk. The contents of the USB stick will be erased during the disk creation process.
Download Windows 11 Media Creation Tool (MCT) from here:
https://go.microsoft.com/fwlink/?linkid=2156295
Run MCT and create a bootable USB disk.
After creating the USB setup disk, connect it to your computer and boot from it. To do so, you may need to change the boot order in the BIOS/UEFI settings. Consult your system or motherboard manual to learn how to access the UEFI settings for your model.
On the Windows Setup language selection screen, press Shift + F10 to enter Windows RE Command Prompt.
In the Windows RE Command Prompt, run these commands:
mbr2gpt.exe /validate /disk:1
Take a photo of the output window and post the image here. Don't quit WinRE yet.
Additional Reference:
For more info about the MBR2GPT command, please see: