I recently bought a computer and with it, the guy gave another one, a small laptop. I tried to log onto windows but i don’t know the password.There is a username when i try to log in, and the computer asks me for the password. So i tryied to reinstall the windows booting from a cd(it has a cd-rom but i’m not sure the comp can see it or recognize it), and it did not work. I just can’t use it. Help