That's the exact message "Windows has turned your profile into a default profile". I don't believe that. Can you gvie the litteral text of the message (without typo's, so google finds it in its database)?
Seems like your profile is corrupted somehow. That can happen. Nobodies fault (well, maybe Microsoft's). Then just make a new one (a new Windows user) and copy your files from the old one to the new one. If you're sure you have all your files and everything works OK, you can delete the old Windows user.
Better ask your mum to do it, maybe. Then if something goes wrong she can only blame herself, not you.
Thankyou if you comment when I log onto my windows 7 laptop it says that it has turned my profile to a default profile and the background goes black and the window colours go black my mum will probably yell at me coz she will think that ivr stuffed it up PLZZZZZ comment
Thankyou the Millsmiester