Splinter Cell 4 Demo

Hello,

I just downloaded the Splinter Cell Double Agent demo, and unfortunately, it crashes every time I try to run it, here is what happens:

Once I double click on the game's icon, and let the companies' logos fly by (and sometimes it crashes during this), but once it crashed while I was loading the first mission of the demo -- but it's always the same error.

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Here's my two error messages:

1. Splinter Cell 4 Crash window pops up and says: "try vortex shader"

then

2. a Windows error window pops up and says this:

Microsoft Visual C++ Runtime Library

Runtime Error!

Program: DoubleAgentDemo\SCDA-Offline\system\SpinterCell4.exe

This application has requested the Runtime to terminate it in unusual way. Please contact the application's support team for more information.

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At first, before running the game, the game scanned by hardware for requirement purposes, and it told me that my Shader was version 2.0, and I needed 3.0. Now i have an ATI x850, so I downloaded the newest driver, and I'm sure I have version 3.0 now, but it still did not work.

Please help me out here, if you know what's going on.

I do have DirectX 9.0c

and my card is the ATI x850 pro.