Not really. In 10 seconds I can reset a router to factory defaults with little more than a ballpoint pen. I can also just use a Linux LiveCD distribution to get around any Windows password you set up. BIOS passwords are pretty easily bypassed as well so long as you have access to the computer. You only have to learn the process one time from the computer manufacturer to be able to repeat it ad infinitum.
Note: This post was edited by a forum moderator to remove personal attack on 11/14/2012 at 9:06 AM PT