What's Up Dude, best bet that i've been using for years has been Irfanview. This program is truly amazing and super easy to use! You could also download this program absolutely free, just go into Google and find. Once downloaded, just open program, find the file you want to resize, then hit ctrl + r and a screen pops up asking what size you want, type 320X240, and it resizes. Go to file and save and voila, you have a wallpaper ready to go!