THE VALHALLA CLASSICS EPISODIC SPEECH ADVENTURETECHNICAL SUPPORT
The first thing you should do is close as many other programs as possible and also disable any screen savers which may be enabled
If that didn't help then try changing your desktop display mode to 16bit
If still no good then try
reducing your desktop size, but remember that 800 x 600 is the smallest allowed
the game seems jerky and slow