How do you get the menu from the first screenshot on top of the thread? When I launch the boot-repair I only get the second screenshot without any visible option to change...

I'm trying to restore my windows loader. I made a fresh install of Ubuntu, the Windows menu option is the grub menu at startup but when selected I get a blank screen with the cursor waiting on the top left and nothing else happens.

I've tried running boot-repair but it doesn't seem to fix the problem, that's why I'm asking for the option to go to the first screenshot menu option of boot-repair.

Thank you