Like Port Royale In Multiplayer Additional Information To My Last Question About My Game Not Working On My Cpu...?

Additional information to my last question about my game not working on my cpu...? - like port royale in multiplayer

Here are the details of my system.
Pentium (R) 4 CPU 2.40GHz
2.40 GHz, 512 MB RAM
Microsoft Windows XP
Home Edition
Version 2002
Service Pack 2
I hope you feel better and this is my video card and nothing if its somthing is even easier than it was.
How do I know which graphics card you have ... and I have to buy another or can I upgrade to Internet, I have to figure out which graphics card ...
Civilization 4, said minimum - 64 MB video card with hardware T & L (GeForce 2 / Radeon 7500 or higher) --
recommends a "128-MB graphics card w / Direct X 8 (pixel and vertex shaders) --
I have the Direct X 8 and the game is using Direct X 9
"The Sims 2, Port Royal, IL2 Forgotten Battles, Gangsters 2, all the work, not calculated from CIV 4 - ideas or help is greatly appreciated, and yet, as I can what I can find the video card updated online free or do I buy a new one, I just want to play my Civ 4
Cluster thankyou