Check the solutions on how to make a bootabile CD/USB.
Check the solutions on how to make a CD-Drive/USB be a primary boot device.
Once you've made a bootabile CD/USB with Windows XP on it, put it in your computer. Reboot the computer and then press any key for it to boot.
One of the easiest ways to reset your password would certainly be to reinstall your operating system all together. See the solutions on how to backup your files and then the solutions on how to reinstall your operating system.
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