Win XP: Refresh thumbnails

Select Search from the Start menu (in some older Windows versions this menu item will be named Find), choose to search for files or folders, and search your local hard drives and their subfolders for files named Thumbs.db. When the search is finished, you'll have a list of all the thumbnail files. Click within the results area, press Ctrl+A to select all of them, and press Del to delete them. You'll have to confirm that you want to delete them, and you'll get a second confirmation request because Thumbs.db is nominally a system file; click on the Yes to All button. Now all of your folders with pictures will get new, fresh thumbnails the next time you view them.