That happened to me too but I found out you need a 3in1.bmp in the shell folder. Download
this and take out the 3in1.bmp and put it in your shell folder and the static image will go away and be replaced with the new one. You can always open it in paint and change it to what you want, like an exact copy of the top bar of your bottom screen background so it blends in.
As for actually erasing the game only, I don't know if there is a way to do that. If anyone knows how I'd like to know.