Does Geforce4 mx420 have or support pixel shader 1.1

Sadly it does not. It has no pixel shader at all. I am plagued by the same graphics card and cannot play team fortress 2 because of it. It is an outdated card and you should probably upgrade. However you can emulate pixel shaders if you have enough CPU but not enough cash to buy a new graphics card. But prepare to lag because even some of the best emulators don't go as fast as grapihics cards. Buying a new card is your best bet