My son closed his business and gave me one of his computers. He allowed his employees to put passwords on the computers without him knowing their passwords. He gave me one of these computers, a Dell Optiplex 150. I cannot use it because I do not know the password and he cannot contact the former employee, who may not even remember the password. The operating system is Windows 2000. I tried getting into the bios and changing the password, but that’s apparently a different password and does not change the boot up password. I tried booting up in Safe Mode, but it still wants the password before gaining assess to the PC. I ended up reformatting the HD which solved the problem. I would delete this post if I knew how.