A friend of mine gave my brother his old computer an e-machine. It has windows xp installed and have been able to access windows without the use of a password. It was not set up for automatic log on I guess. The default username has always been 'owner' and by clicking enter it would bypass password and log on to windows. Now we cannot access windows at all. It is saying username, domain name or password incorrect - why would it all of a sudden do this?? Have called previous owner and we tried all of his possible passwords and none are working. He says he doesn't remember having a password. Have gone into utilities at start-up to see if there was anything in there for password re-set...nothing. How do we bypass this to log on or what is the solution? 
Thank you
Thank you