If all the requirements (OS - Windows XP/Vista/7/8; CPU - 800 Mhz; RAM - 256 MB; DirectX - 7.0; Hard Drive - 82 MB) are fulfilled, its possible that Mystery Legends Sleepy Hollow to not be correctly installed. In this case, I suggest you uninstall it using its uninstaller or Add or Remove Program feature and run a registry cleaner from Software Informer database. After that, navigate to the official web page, download a new copy of the game and install it using the serial key received when you purchased it.