Jack Keane 2: The Fire Within problem

Hello,
Today I downloaded Jack Keane 2 from Gog.com and it seems to play in slow motion. The audio seems fine and the colors looks good too, but it doesn't seem to be running smoothly.

I am using Windows 7 Pro on a HP Media Center Pavilion PC. It looks like my video card is Nvidia 8400GS. The computer is 5 years old. I am not using a HD LCD monitor. It says HP w2007 on it.

This is the first time that I can remember having a problem like this with a game I downloaded.

Can you offer any advice or guidance?

These are the minimum and recommended system requirements for the game. It could be that your video card or processor aren't up to the system requirements.

Minimum system requirements: Windows XP, Vista, 7, 8, processor Intel Pentium IV 2.8 GHz or equivalent processor with SSE3 (Intel Core 2 Duo 2.6 GHz or equivalent recommended), 2 GB RAM, NVidia GeForce 8600 GT / ATI Radeon HD X1800 video card with 256 MB VRAM and Shader Model 3.0 support (NVidia GeForce 9800 GT / ATI Radeon HD 4850 or better recommended), 3.5 GB HDD, DirectX 9.0c-compatible soundcard.

If your computer isn't up to running the game, are there any settings you can turn down in the game options?