Admin password. Do not have one. start > control panel > Administrative Tools > Local Security Policy > Security Options - scroll down to Recovery Console > Allow automatic administrative logon - set it to Enabled
or just press and hold "Ctrl" and "Alt" and press "Delete" twice while the Welcome Screen is displayed. Type in "Administrator" as the username, and leave the password field blank
or Reset password for Windows XP by hitting f8 at bootup, select safe mode, at logon, go to the admin account, hit enter, and the password is now reset.