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!
Best Amazon Echo: What’s the best Alexa speaker?
Kano Computer Kit Complete review: A fun DIY 'laptop' that teaches kids to code
Best pro photo editors for Mac 2018
TV & streaming : comment regarder les Jeux olympiques d’hiver 2018 ?