In older versions of Windows, security wasn't a priority as it is in modern operating systems today. If you've forgotten the password for an older Windows PC, there are options to either get around it or crack the password itself. One quick and easy thing to try first is to type in "admin" in the user field, and leave the password field blank. If that doesn't work, there is a hidden administrator account that can be activated. Check out these instructions from ccm.net. Lastly, there are programs that will crack a Windows password, such as Ophcrack.