The Password Reset Wizard
Passwords are a double-edged sword. Forget yours, and you could be up a polluted tributary without proper means of propulsion. Think about that one for a second. Then, make a backdoor for Windows XP. The Password Reset Wizard can be found by clicking Start | Control Panel | User Accounts. Select your account name, then under Related Tasks, click the "Prevent a forgotten password" option. The wizard will guide you through the rest of the way. That's his job, after all. It's your job not to forget your password, but since you're human, we all know it could happen one day. Make another one for good measure and store the disks in a very safe place (away from heat, moisture, magnetic fields, and your kid).