99% sure this is due to being *well* under the minimum processor requirements but I know I also had a very similar problem (among others) with Ground Control that was later patched.
The game itself doesnt seem to stutter but the sound clips in game (not the cinematics) stutter and repeat the same thing over and over. For example, if the sentence were "Crew ship docking with mothership" it would repeat "Crew ship" over and over for the duration of the original sentence.
256 MB Ram
GeForce Ti 4200 (latest Nvidia drivers)
Creative SB Live!
Windows 2K Service Pack 4
Like I said, I'm pretty sure its my processor choking but I know quite a few people (including myself) had the same problem with GC which was eventually patched out.