all you have to do it open command prompt, you do this by clicking start, then run. In the box, type cmd. This should open a black window. In this window, you type net user administrator *. (no period). you can replace the administrator part with any username you like. If you want to do this at school, however, you need to turn the computer off and then back on, and before it gets to the login screen, you have to hold the f8 key. this takes to to a boot menu (sorry, no screenshots), and you select start in safe mod (with command prompt). Then, you can do this. If it still won't let you use the run command (which at schools it usually won't unless you start in safe mode), you will have to find a way to open cmd, (command prompt in case you haven't figured that out yet). The rest works the same way, most problems occur just trying to open cmd. After you've typed in a new password, you can hold log in to the person's account whose password you changed. Oh, and try not to let the person who owns the account catch you guys