✔ 最佳答案
Well if you have Windows XP, at the startup, there should be a login name you can select. This can be equiped with a password. All you have to do is open the start panel, and click on your picture all the way at the top next to your name. It will bring up a window with some options. Go to the one that says Add or Change a Password. Once you have done that, every time the computer is turned on, at the loggin it will prompt you for your password. Or else you can't access anything. Another simple thing to do is to take the power cords away and hide them. Thats easier than moving the entire moniter. Also make sure that your name is the only name on the loggin screen or else he will just log on to someone elses name (unless you put passwords on those ones as well).
Hope i didn't confuse you to much.