How to Log On to Windows XP If You Forget Your Password
Here's one a lot of people have been looking for. This article explains how to log on to Windows XP if you forget your password, or if your password expires and you are not able to create a new one.
Method 1: Use a Password Reset Disk
If you created a password reset disk on a Microsoft Windows XP Professional-based computer, reset your password by using the password reset disk.
Method 2: Log on as Administrator and Reset the Password
Source:
Microsoft Support 
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