Carol's computer monitor died, and she bought a new one. Now she has a screen that says "Welcome to your new computer" and her settings have vanished. After running a restore point, she got it back to normal, and the same thing happened the next day. Leo says that the her Windows profile may have gotten corrupted, which can happen. Carol can find instructions on how to fix a corrupted profile at support.microsoft.com. The best way to fix it is to reinstall Windows, though.
Another thing she can do is create a new profile and make it an Administrator and then manage her other profile from there. It could also be a faulty hard drive causing the issue.