I bought COD MW2 but I cannot play it because I do not have vertex shader 3.0 which, after googling, I found that most cards (I have a radeon 9800 pro which I assume is capable) just need a software upgrade and I found the file to download. It was a RAR file which I extracted but I am not sure on what to do next for the upgrade to go into effect as I still get the same error message when I try to open up my game. In the extracted directx folder there are at least 100 different files and I am unsure of what I need to do next.