This tutorial is for how to add a new user account on windows xp. You really only need to do this if you are sharing your computer and need different accounts.
Step 1: Go to Start -> Control Panel -> User Accounts
Step 2: Under the section ‘Or pick an account to chnage’ Select your user name-> Click on change my password
Step 3: Enter your old password and now enter your new password twice.
Well done your password has now been changed!