In this tutorial, we learn how to resize thumbnails in Windows XP. First, close all the windows on your computer, then go to your start menu. Next, type in "regedit" under "run" and then click "enter". Now you will see a registry editor, find your current user path when you get to this page. Now, go under the software folder, then the Microsoft folder, and then the Windows folder. Next, go under "explorer" and create a new "DWORD" value called "thumbnailsize" and set a value between 32-256. After this close the window and then check to see if your thumbnails are smaller, then you're done!