DirectX error message

I downloaded a demo game but when I went to launch it I got a pop up window saying error.
Is there something I should update or is my PC just too old? I am running Windows XP.
I went to the Microsoft support site and downloaded Direct X 9c Runtime....but still get the error pop up when I try to launch the demo.

What game demo are you trying to download?

What game demo are you trying to download?[/quote]

I did not seem to have any problem downloading and installing it....But it throws up that error message when I try to play it.
its called Pain Killer.
I have gone to the same site [ File Planet ] and downloaded the same demo with no problems on another computer.

A quick Google suggests that quite a few people had your problem. This seemed to work for a few them, might be worth a try.

1. download / install 3D-Analyze (http://www.3dfxzone.it/files?object=3dfx&objid=100)
2. select painkiller.exe
3. check Emulate HW TnL
4. check Force SW TnL Caps
5. click run

Downloaded and ran 3D-Analyze but it showed no problem.