You are using XP so is the password you're being asked for,the "Administrator" password.
Someone is set up on your PC as administrator [Control Panel/User Accounts]so did that person enter an administrator password?
Just a thought!
Fujitsu Lifebook P727 laptop review
11 best portfolio websites for designers and artists
Office for Mac buying guide: Price, Office 2017 rumours & new features
Comment désactiver les programmes qui s'exécutent au démarrage de Windows 10 ?