Diego, I've been through that situation, and that's a real mess.
You should try to find a backup on your windows partition. look for bootmgr.efi and BCD.log. there should also be a lot of language folders with it. If you got this folder, copy it to (your efi disk)EFI/Microsoft/Boot.
If you don't find BCD.log or if they don't work, try a rescue boot from Windows disk. They have some commands to generate the files.
Diego, I've been through that situation, and that's a real mess.
You should try to find a backup on your windows partition. look for bootmgr.efi and BCD.log. there should also be a lot of language folders with it. If you got this folder, copy it to (your efi disk)EFI/ Microsoft/ Boot.
If you don't find BCD.log or if they don't work, try a rescue boot from Windows disk. They have some commands to generate the files.