How do you check what pixel shader your card supports

The easiest way to determine this is by simply looking up your video card model number online. To find out what video card you have, open up the device manager (control panel > system > hardware tab > click device manager) and look under "display adapters."

Make a note of whats in your system & search online, or post a new question here along the lines of "What pixel shader level does video card XYZ support?"