Just bought a 68 GTS H code
If by chance you have Microsoft Office on your PC you can use Picture Manager, or you might try using Paint, I believe some have done that.
If those aren't an option there are several free programs available online although I don't know what they are called.
Here is one you might try.
[ame="http://download.cnet.com/Free-Picture-Resize-Starter/3000-12511_4-10297789.html"]Free Picture Resize Starter - CNET Download.com[/ame]