you have a poo graphics card, simple as that
, see if you can disable the (I suspect Intel) chipset and install a video card that actualy does do three-d instead of just implying it does, some of these onboard chipsets (esp those with shared mem) would have trouble running pacman in realtime, remember office machines don`t need to display text at 100fps.
seriously, if you can disable the chipset in the bios or have an AGP port on the MOBO then get yourself a budget card and you won`t recognise it for the same machine, when I installed my 1st accelerator I couldn`t believe the difference, even 2d games ran faster, anybody with a pc with no 3d acceleration is living in the past, do yourself a favour, even a tnt2 would be better than whatever you currently have.
if the GFX card cannot handle the three-d then DX will give the work to the main CPU, the result is something like between 10-30fps with no nice shaders or reflections and a screen that looks like the game was rendered in the old Doom engine, you NEED a 3d card that has the guts, my very old p300 celery with a TNT2 card can do better than that.
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