I get this often...I don't have to reinstall my game, I just go to the configuration and change the game to a higher resolution, for some reason it automatically switches to 400x300 from time to time. If it's the same problem with you just change the resolution to a higher one and it should work.
Like S.Williamz said, try to launch the "Configuration" tool from "Start -> Programs -> Tennis Elbow 2006", and set the mode to 640x480 or 800x600, then launch the game again, and it should be fine.
ManuTOO == Mana Games == >> I don't answer Private Message, except if it's really a _Private_ topic <<