How to Download and Use XP User Images
Right-click on the image that you want to download, and select "Save Picture As." Choose a location(one you can remember) on your hard drive to save your image(s) and click the "Save" button.
Next click on the "Start" button at the bottom of your screen, and click on "Control Panel." A new window will pop up with several sections; click or double-click "User Accounts." You will be able to see a complete list of users for your computer. Click on the user account that you wish to add the picture to. Click on "Change my Picture," then select the option "Browse for more Pictures." Find the image where you just saved it, and then click the "Open" button. Your image has now been changed. Close the "User Accounts" window and the "Control Panel" window.