When I try to convert my drive from MBR to GPT using mbr2gpt.exe it says “cannot find room for EFI partition. Conversion failed”

Hi Gabriel, hope you're doing well. I'm Ian, and I'm happy to help you today.

You're running into a common issue where mbr2gpt.exe fails because it can't find enough unallocated space to create the required EFI system partition (ESP).
1. Open Disk Management by pressing Win + X then select Disk Management).
2. Locate your system drive (the one with Windows installed).
3. Check if there is at least 100MB of unallocated space at the beginning or end of the disk.
If there's no unallocated space, mbr2gpt.exe cannot create the EFI partition.

If you don’t have unallocated space, you need to create it manually:
1. In Disk Management, right-click your system drive > the last partition before unallocated space.
2. Select Shrink Volume.
3. Shrink by at least 200MB (to be safe).
4. Once shrunk, right-click the new unallocated space and make sure it's at the end of the disk.

I hope this helps, but please let me know if you need anything else.