To customize your User accounts icon:

• Single-click the Start menu
• Click Control Panel
• Single-click the User Accounts icon
• Select your account and click on it
• Click on the text Change My Picture

  You have the option to Pick one of the predefined icons

  • Highlight the one you like best
  • Click the Change Picture button
  
  -- or --
  to choose your own picture
  • Click the click the magnifying glass or text the Browse for more pictures
  • In dialog box navigate to where you stored picture to be used
  • Click Open to save your changes