how do i get the shader model 2.0?

Shader model versions are built into your video card. If your video card doesn't support shader model 2.0 the only way to get it is to buy a new video card.

Shader model 2.0 has been around for many years, if you have a newer video card try reinstalling your video drivers.

Download Drivers

Go to the website of the manufacturer and select your model (this is usually done in the Support section). You should have the option to download drivers for your model if they have drivers your your Windows version. Download the driver(s) and follow the instructions to install - every computer is different so I can't give you exact directions. You can also try using Windows Update to get drivers - it's located in the start menu.

Update driver for hardware that isn't working properly:

http://windows.microsoft.com/en-us/windows7/Update-a-driver-for-hardware-that-isnt-working-properly

If this game is requiring Pixel Shader 2.0, it also likely means your computer does not meet the minimum requirements to run the Windows Aero experience. You should find out what type of graphics adapter is supported by your computer whether it is AGP or PCI

Refer to the following link for a list of Windows 7 compatible graphics cards:

Windows 7 Compatibility for Graphics cards and components

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Your computer's hardware and video card must meet hardware requirements to able to display Aero graphics. Check that your computer meets the minimum hardware requirements for running Aero:

1-gigahertz (GHz) 32-bit (x86) or 64-bit (x64) processor

1 gigabyte (GB) of random access memory (RAM)

128-megabyte (MB) graphics card

Aero also requires a DirectX 9 class graphics processor that supports a Windows Display Driver Model Driver, Pixel Shader 2.0 in hardware, and 32 bits per pixel.

For best results, you might also want to follow these graphics processor recommendations:

64 MB of graphics memory to support a single monitor with a resolution that is less than 1,310,720 pixels (for example, a 17–inch flat panel LCD monitor that has a 1280 × 1024 resolution)

128 MB of graphics memory to support a single monitor with a resolution from 1,310,720 to 2,304,000 pixels (for example, a 21.1–inch flat panel LCD monitor that has up to a 1600 × 1200 resolution)

256 MB of graphics memory to support a single monitor with a resolution greater than 2,304,000 pixels (for example, a 30–inch wide-screen flat panel LCD monitor that has up to a 2560 × 1600 resolution)