This is what the site map looks like. There doesnt seem to be a way to move it back to the root.

Do I need to reinstall?

If I uncheck "show system pages" then the whole site map is then empty!

How did you actually succeed in moving it under your login page in the first place?

Have you tried moving login under home the same way you moved home under login ? Grab and drag login over home, select move login under home. After you should have it back to normal.

My sitemap won't let me drag 'Home' anywhere. That's why I asked him how he managed to move it in the first place.

Don't remember. Was trying to remove something from the trash back, and i think that I dragged it onto home, and then thought that I was clicking "make this a child of home" and instead, home became a child of it, inside of the trash.

the only way that I could get home out of the trash was by dragging it to another page, so I chose login.

And I have tried moving login to underneath home, but it errors (can't make something a child of it's child)

Because no good answer has come up... Have you tried to delete the Home page and than pull it out of the trash under login in an attempt to reproduce what caused this in the first place, but in reverse ?

Yeah, got a message saying "cannot delete the home page".

So I installed a vanilla copy and have spent the past day and a half copy and pasting content.