Another thing you could try is to make a desktop shortcut to the game executable. To do this,
Right-click the desktop where there is no icon,
Move the Cursor to where it says New, and then across to click on Shortcut.
Browse to where the game executable is and highlight it. From what Syd said, it would be inside the Indark3 folder that's inside the I-Motion folder.
Click Open, then Next and Next and Finish.
If it's a DOS-type shortcut, right-click on it and choose Properties.
Click the Program tab, then the Advanced button.
Put a check where it says "Prevent MS-DOS-based Programs from detecting Windows" and OK out of it.
Then see if it works any better.
I remember someone else had problems with a Riptide sound card when they tried to play DOS games. It doesn't seem to have very good DOS sound emulation.