Each time that you open a folder with pictures in XP, Windows creates a system file called Thumbs.db. This is a hidden file, and its purpose is to increase the speed with which your PC can display thumbnails each time you return to that folder. The thumbs.db files, however, can take a lot of valuable space, particularly if you have several pictures.
These files can safely and easily be removed from your system, and you can even prevent XP from re-creating them by disabling your thumbnail cache. Read on to learn how to clear and disable your this cache.