Welcome to TechIMO!
You have downloaded and installed the latest ATI Radeon driver and Microsoft DirectX runtime, correct?
Make sure to turn off FSAA and AA for the Radeon under the ATI control panel. Such filtering routines can bring the 9200 chipset to a crawl. Also try moving the rendering quality sliders back a couple of notches to mid-range settings.
Otherwise, the PCI graphics card is limiting your 3D performance. The PCI bus offers bandwidth of a mere 133MBps; not enough to sustain a high level of texture transfers for quality 3D graphics rendering. Outside of upgrading to a motherboard with an AGP slot, you may have a hard time reaching your desired performance level.
Hope this helps,
Robert Richmond