Your basic problem is the Radeon 9200 is a low spec card, inside the game requirements but only just. Its a poor 3D performer. We may be able to get it to run, but it will be slow(ish), unlikely be able to play at the larger/huge map sizes, will need to reduce video quality/textures/resolution etc, and I think you will have increasing problems with Civ IV as the game develops over time. I would seriously think about getting a mid range card to replace it, you will notice a significant performance increase, and much less hassle, mid range cards are not too bad in price these days. Research carefully if your motherboard will take the card re heating issues
Sony Electronics Support:
http://esupport.sony.com/EN/feedback/feedback.html
Meanwhile ..... Can try these, all will reduce the load on your graphics
Make sure you have loaded Patch V1.52, but, also ensure that the memsaver switch in the ini file is set to 0 (figure 0 not a letter O). The reason is that 1.52 placed more load on video cards to help those with low main RAM, if memsaver is switched on (using a 1 in the ini file entry) it switches on that feature which you dont want as your graphics card is your weak spot.
- Turn off textures in the game Options menu
- Set the game resolution to as low as possible
- set your desktop resolution to the same as you are going to use in the game
- set the desktop refresh rate to 60Hz
- Turn off any background application or services running that you dont really need (via MSconfig). That includes going off line to play Civ, and turning off Anti-V & Firewall.
- Set your pagefile to 2000mb, min=max
Video Drivers
The Video drivers you have are outdated (2004), download new drivers from here
http://www.omegadrivers.net/
Scroll down that page until you see Radeon Omega Drivers 2.5.97a (Catalyst 4.12) they are not the latest,but they are a very stable reliable set, and probably better for your older setup. If they dont work properly, try Radeon Omega Drivers 2.6.83 (Catalyst 5.11) at the top of the page
If you still have no significant performance increase, and I have doubts that you will, in my opinion it will be a Video upgrade as your graphics setup is bare minimum
Regards
Zy