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How do I change my password in Windows XP?
Control Panel > Users > [your username] > Change Password
Click Change Password
In case you were interested, you can also do this on the command line:
net user <your username> *
This will prompt you to enter a new password for your account. You can also substitute * for the actual password which will change it without any prompting.
If you have owned another available admin password, it can work: