Try opening your image in "Paint", found on every PC I believe. Click "Image" then "stretch/skew". You'll be able to re-size the photo in the stretch/skew box that opens. If you need to crop a photo you can do that using the "select" box and then choosing the area of the photo you want to keep. After you select the area, right click and choose copy, then paste into a new blank image.
SoreKneesDayton - I'm not familiar with VSO but thanks for posting the info. I always like to check out new stuff for pictures.
I suggest you don't try and crop your images. Instead you should re-size them, you can get freeware that can do it. I use Photoshop, but that's a fancy program. Infact the program you use to crop should have a re-size option. Look around the menu lists for a re-size button.