Pixel Shader 2.0 Drivers

I've been wanting to play a PC game called "League of Legends" for a while, and when I downloaded the game and tried to launch it, it said something along the lines of "Your graphic card does not support Pixel Shader 2.0" I don't think its that my computer can't handle it (its an 2004, but I've had it run plenty of games that have pixel shading like Warcraft, Command and Conquer, etc)

So I went to the game's site and was directed here to get the drivers (this is what I was told was posssibly the problem, not having the drivers).  I came here to download the drivers, and yet whenever I try to download them and run the file to get them to work, it doesn't even open them.

Any ideas on what I might be doing wrong? I downloaded the files to get the pixel shader 2.0 to work, but it doesn't even open like most normal documents I download do.