Forgot your Windows XP password here is how to crack it...

Ophcrack

If you're feeling brave, or like to play hacker, you can download the free Ophcrack program from another PC, and burn it to a CD.

With Ophcrack, you can create a live CD that has a bootable operating system that will let you start Windows. From there, the program automates the retrieval, decryption and cracking of Windows passwords. If your password has 14 alphanumeric characters or fewer, the program should be able to crack it within minutes.