1 cent
256 MB graphics card support pixel shader 3.0
you must have graphics card that supports shader model
You cannot download Pixel Shader because your graphics card should already have and support it. If not, you will need a new graphics card which supports it.
pixel shader is a program that executes inside the graphics processing units (aka graphics card) so you wont be able to "find" it. :P However, if you're talking about pixel shader setting. It can be found in the pcsx2 settings, under graphics. remember, you will also need a graphics card that support pixel shader, or it will crash.
You have to upgrade you graphics card to use this feature
Nowhere. Pixel Shader is a hardware feature that comes with your graphics card. Most graphics cards these days support pixel shader 3.0 or higher and are at a low price.
possibly
Yes. Shader 5.0
Pixel Shader 2 is a graphics card feature. It is needed in order to play some video games. Typically ones that have a high amount of graphics.
I believe your graphics card must support pixel shader 1.1 in order to play TF2.
you cant you will have to buy a new graphics card that supports pixel shader 2.0,3.0
It is not possible, since pixel shader 2 is hardwared into the card. You would not be able to upgrade without changing a graphics card.