Need help installing wallpaper theme

[kaligirl76]

So I think I did something wrong. I uploaded ADW. Launcher and my theme to run it on (for my MyTouch 4G). When asked what "program" to make my wallpaper default I choose the other one, can't remember the name, but it wasn't the ADW.Launcher. So now I have both my theme downloaded and the launcher but can't run either of them. Is there a way I can go back and undo the default?