Originally posted by The Fugitive 
Run DXdiag on your computer and post the first third of that report here (save to text button is int he lower right corner of DX box.)
From what you posted already, you might just be on the edge with your machine. What texture size are you running in the game, and are you "pre-loading" any textures (start game and look under the Video button)
With only 512 memory the upgrades in graphics in patch 3 might have been enough to choke your system a bit. You may be OK with just turning down some of the eye candy in the game. 
 Hey Fugitive, is this the info your looking for?
System Information
------------------
Time of this report: 11/23/2007, 08:48:39
       Machine name: ACER-C2D0F03B5F
   Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.050301-1519)
           Language: English (Regional Setting: English)
System Manufacturer: Acer
       System Model: AcerPower S285
               BIOS: Phoenix - AwardBIOS v6.00PG
          Processor: Intel(R) Pentium(R) 4 CPU 3.06GHz (2 CPUs)
             Memory: 512MB RAM
          Page File: 379MB used, 871MB available
        Windows Dir: C:\WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.2600.2180 32bit Unicode
DxDiag Notes
------------
  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found. DirectDraw test results: All tests were successful. Direct3D 7 test results: All tests were successful. Direct3D 8 test results: All tests were successful. Direct3D 9 test results: All tests were successful.
        Sound Tab 1: DirectSound test results: All tests were successful.
          Music Tab: DirectMusic test results: All tests were successful.
          Input Tab: No problems found.
        Network Tab: No problems found. DirectPlay test results: All tests were successful.
Display Devices
---------------
        Card name: NVIDIA GeForce FX 5200 
     Manufacturer: NVIDIA
        Chip type: GeForce FX 5200
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_0322&SUBSYS_00000000&REV_A1
   Display Memory: 128.0 MB
     Current Mode: 1024 x 768 (32 bit) (75Hz)
          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: nv4_disp.dll
   Driver Version: 6.14.0010.7184 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 2/24/2005 01:32:00, 3973888 bytes
      WHQL Logo'd: Yes
I always ran in 1024 32bit hires with all the bells and whistles on,even dl'd the hires pack, But after the Patch 3,,,,,I cannot enjoy that anymore.
 From what your saying, that P3 update must have included alot more eye candy thats now killing my machine?  
Guess that means increasing ram and/or more mem on video card?
Thanks again for the help.