Under disk management in Windows I can see an EFI partition. This was factory shipped as EFI Partition. You mean the code you supplied will install Grub there? Will it be Grub 1 or 2 that's going to install? What should I do with the Grub that was installed on my MBR when I did the legacy install prior? Delete it?
I log in with my username and password and then type those commands you provided in terminal?