can't start brick game

Hi,
I have bought, installed and played Brick Quest 2 for a couple of days now. However, yesterday I tried to open the game and it refused. The cursor changes for a couple of seconds but after that it just returns to normal and nothing happens. If I try to open it via Game Manager after that it says (sometimes) that the game is already running. But I can't see it anywhere.
Help!!! I really like this game.
I already tried to uninstall and reinstall it a couple of times but even that doesn't help.
Anyone knows what to do about it?????