...or:
Basically, at Windows XP Welcom Screen, simply press Ctrl-Alt-Del keys sequence together twice, and you will be shown a Log On to Windows menu which you can specify User Name and Password. In the User Name text box, key in “Administrator” (without quote) and leave the Password field blank. Then press Enter or click on OK. If there is not password protects the Administrator account, or blank password is set, then you will be able to access the Windows with full administrative privileges as Administrator.
Once you can login as administrator, you can go to control panel / user accounts, select your normal account and reset the password.