I need to lock windows at the desktop. Due to an evil 12 year old and a 24/7 always on connection. I'm not sure how extensive her computer knowledge is, but just to be safe, lets assume it's extensive. I have 2 different windows books, but all they offer are the cheesy kind you can opt out of with cancel. This will not be acceptable. The keyboard is cordless, but the mouse is not. I need heavy duty high level security. How do I do that?