Booky, I've seen a similar problem with a few different Creative boards, including my own SB Live.
Go to Control Panel
Select MultiMedia
From the Audio tab, in the "Playback" section, select Advanced Properties
Now, under the "Performance Tab, there will be two sliders.
Try moving the Hardware Acceleration slider down one or more notches.
I had to move mine down two notches, but it cleared up the screen stutter, that happened whenever I fired my guns.
Try it out, it might solve your problem.
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Vermillion
**MOL**, Men of Leisure