|How to log on to your Windows XP-based computer if you forget your password or if your password expires: http://support.microsoft.com/kb/321305|
Basically, first lets try to log in with administrator. If the administrator account has a password that you dont know (make sure you try no password), there are additional things you can do to reset your password. Like a Hirens Boot CD: http://www.hirensbootcd.org/resetti...
Please provide make/model and if you are running XP Pro or Home (SPx) in any reply. Thanks!