How can I bypass a login screen on a used computer?

Episode 946 (2:39:37)

Delores from Philadelphia, PA

Delores got a used computer and she needs to access the user name and password. Sometimes, an administrator account with no password is left on the PC. So when she boots it up, press the F8 function key and enter the login name - administrator - and hit return. It doesn't work on all computers or operating systems. After XP is when it stopped, but it's worth a try.