I have Geforce Fx5200 128mb pixel sha...

Yes with a better graphics card. You need Shader 4.0 at least on that graphics card. (Plus a lot more Stream Processors)

The GeForce FX 5200 is an AGP style of graphics card, and uses 8X speed. (0.8 Volts)
It is a Budget graphics card, and does not have the graphics 'power' needed for the games you stated.
(If memory serves it has 16 Stream Processors)

There is no 'miracle' program, or tweaking of settings, that will allow you to run the above stated games at a decent capability. Even at low settings for the games.

I would suggest an ATI HD Radeon 3850 at least.
HOWEVER, other things come into play.

You need a 400 Watt power supply that has 30 Amps on the 12 volt power rail. The power supply must have a 2x4 power cable. (Example:

http://www.playtool.com/pages/psuconnectors/connectors.html#eps4plus4 )
OR, enough 4-pin Molex power cables that are unused to put in a 2x4 power cable adapter.

Your processor has have the processing power needed also, or you will have a 'bottleneck' of graphics information.

A graphics card has it's own processor. (GPU. Graphics Processing Unit)
It also has it's own Ram Memory. (Graphics ram memory)
However if the processor is too slow, the graphics information cannot be processed from the processor to the game program, and vice-versa, in a speedily fashion.

Graphics information, (Data), hangs up. Frames freeze, and frame rate slows down.

Post the computer name , model name. and model number, and we'll see if a better graphics card will help.
(Example: HP Pavilion D5200t)

I have the same card and you should be getting 256mb maybe the shadder 2 takes the other 128mb. I've seen cards in the 7000's that had a hard time playing those games. The updates I don't like. I use a later version. But, No, You have to get up to 512mb and 1.5 to 2 gig RAM 2 ghz computer power to play the real neat high graphic games.