XP Suddenly asking for password [duplicate]

Perhaps you added another user. This will cause it to ask for a password. It might be a hidden user.

Try using (WIN+R)

control userpasswords2

To see if anything unusual is there, and you can also make sure the "users must enter username and password to use this computer" box is unchecked.


I solved this using the Offline NT Password & Registry Editor. This tool is a lifesaver in situations like this.