Um....Do explain what you mean, and how it relates to the size of image. Nifflas (and everyone else) is trying to help you. Make the image smaller to see if that works, if it doesn't, then you'll have to come to a different alternative. As far as I know, the portable version and the normal versions are the same thing, just they store settings/stuff elsewhere. It has nothing to do with what Nifflas is asking you to do, which is make the background picture smaller in size, so that maybe your card would display it. I don't see why it being the 'non-portable' version matters in this case...
So please enlighten me (and others, I'm sure) if I don't quite understand what you mean by 'non-portable'.