Soooooo, I seem to have myself in a very particular situation. Let me start from the beginning, I set up dual boot with Windows 10, and Lubuntu. Everything went according to plan. I then decided that I wanted to remove dual-boot. I looked on several articles some saying to use bootrec.exe, to repair and remove it but then I realized “It doesn’t use the windows boot manager… it uses grub.” So with this knowledge I searched for guides on how to remove grub. I found a guide (http://linuxbsdos.com/2015/09/05/how-to-delete-grub-files-from-a-boot-efi-partition-in-windows-10/) I could not access my system drive, so I dual-booted into Lubuntu and used root to access the EFI folder and deleted the “ubuntu” folder and rebooted to a happy little message saying: Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key_ . I realize that all my data is still there. I realize that in deleting the “ubuntu” folder that I deleted critical files part of the loading of grub. I now need to somehow replace these files, and get back to Windows 10.
Sidenote: I don’t have bootrec.exe as a command. I checked this before I deleted the grub files.
I will recommend you to first reinstall GRUB using a Live USB/CD of Lubuntu and then repair your boot drive by using Boot Repair. Follow the steps on link provided and then use bootrec.exe to achieve your goal.