An employee of my mom's work formatted her laptop to install a program on her computer. First of all, I don't understand why he formatted her PC.
Now, when I start the computer, before logging in it says I have to press Ctrl+Alt+Del and then I have the message "Preparing desktop".
It doesn't matter what I do on the computer (install Firefox, add shortcuts, etc.) each time I restart the computer it will put everything back to its default (shortcuts are gone, Firefox not installed, etc.).
I have no idea what he did, but if you have an idea or a clue as to what I should do to fix it, please let me know.