I am having the same problem.  
Have set all 3 video setting the same.  Have no other apps or antivirus running while playing.
DXDIAG:
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System Information
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Time of this report: 8/18/2009, 16:52:04
       Machine name: HOME-EB0AE14363
   Operating System: Windows XP Professional x64 Edition (5.2, Build 3790) Service Pack 2 (3790.srv03_sp2_gdr.090319-1204)
           Language: English (Regional Setting: English)
System Manufacturer: To Be Filled By O.E.M.
       System Model: To Be Filled By O.E.M.
               BIOS: Default System BIOS
          Processor: Intel(R) Pentium(R) D CPU 3.20GHz (2 CPUs), ~3.2GHz
             Memory: 3264MB RAM
          Page File: 444MB used, 4666MB available
        Windows Dir: C:\WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.3790.3959 32bit Unicode
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DxDiag Notes
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  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
          Music Tab: No problems found.
          Input Tab: No problems found.
        Network Tab: No problems found.
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DirectX Debug Levels
--------------------
Direct3D:    0/4 (n/a)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay:  0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow:  0/6 (retail)
---------------
Display Devices
---------------
        Card name: NVIDIA GeForce 9400 GT
     Manufacturer: NVIDIA
        Chip type: GeForce 9400 GT
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_0641&SUBSYS_00000000&REV_A1
   Display Memory: 1024.0 MB
     Current Mode: 1280 x 960 (32 bit) (70Hz)
          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: nv4_disp.dll
   Driver Version: 6.14.0011.8048 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 11/12/2008 14:54:00, 8914560 bytes
      WHQL Logo'd: n/a
  WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: nv4_mini.sys
    Mini VDD Date: 11/12/2008 14:54:00, 8149504 bytes
Device Identifier: {D7B71E3E-4501-11CF-C07C-0B2000C2CB35}
        Vendor ID: 0x10DE
        Device ID: 0x0641
        SubSys ID: 0x00000000
      Revision ID: 0x00A1
      Revision ID: 0x00A1
      Video Accel: ModeMPEG2_C ModeMPEG2_D ModeWMV9_B ModeWMV9_A 
 Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
         Registry: OK
     DDraw Status: Enabled
       D3D Status: Enabled
       AGP Status: Enabled
DDraw Test Result: Not run
 D3D7 Test Result: Not run
 D3D8 Test Result: Not run
 D3D9 Test Result: Not run
-------------
Sound Devices
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            Description: Realtek HD Audio output
 Default Sound Playback: Yes
 Default Voice Playback: Yes
            Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0662&SUBSYS_18493662&REV_1001
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: RTKHDA64.SYS
         Driver Version: 5.10.0000.5519 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: n/a
          Date and Size: 11/27/2007 07:07:00, 4632064 bytes
            Other Files: 
        Driver Provider: Realtek Semiconductor Corp.
         HW Accel Level: Full
              Cap Flags: 0x0
    Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
 Static/Strm HW 3D Bufs: 0, 0
              HW Memory: 0
       Voice Management: No
 EAX(tm) 2.0 Listen/Src: Yes, Yes
   I3DL2(tm) Listen/Src: Yes, Yes
Sensaura(tm) ZoomFX(tm): No
               Registry: OK
      Sound Test Result: Not run
---------------------
Sound Capture Devices
---------------------
            Description: Realtek HD Audio Input
  Default Sound Capture: Yes
  Default Voice Capture: Yes
            Driver Name: RTKHDA64.SYS
         Driver Version: 5.10.0000.5519 (English)
      Driver Attributes: Final Retail
          Date and Size: 11/27/2007 07:07:00, 4632064 bytes
              Cap Flags: 0x0
           Format Flags: 0x0
-----------
DirectMusic
-----------
        DLS Path: C:\WINDOWS\SYSTEM32\drivers\etc\GM.DLS
     DLS Version: 1.00.0016.0002
    Acceleration: n/a
           Ports: Microsoft Synthesizer, Software (Not Kernel Mode), Output, DLS, Internal, Default Port
                  Microsoft MIDI Mapper [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal
                  Microsoft GS Wavetable SW Synth [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal
        Registry: OK
     Test Result: Not run
-------------------
DirectInput Devices
-------------------
      Device Name: Mouse
         Attached: 1
    Controller ID: n/a
Vendor/Product ID: n/a
        FF Driver: n/a
      Device Name: Keyboard
         Attached: 1
    Controller ID: n/a
Vendor/Product ID: n/a
        FF Driver: n/a
      Device Name: Saitek X52 Flight Controller
         Attached: 1
    Controller ID: 0x0
Vendor/Product ID: 0x06A3, 0x075C
        FF Driver: n/a
Poll w/ Interrupt: No
         Registry: OK
-----------
USB Devices
-----------
+ USB Root Hub
| Vendor/Product ID: 0x8086, 0x27CB
| Matching Device ID: usb\root_hub
| Service: usbhub
----------------
Gameport Devices
----------------
------------
PS/2 Devices
------------
+ Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
| Matching Device ID: *pnp0303
| Service: i8042prt
| 
+ HID Keyboard Device
| Matching Device ID: hid_device_system_keyboard
| Service: kbdhid
| 
+ Terminal Server Keyboard Driver
| Matching Device ID: root\rdp_kbd
| Upper Filters: kbdclass
| Service: TermDD
| 
+ Microsoft PS/2 Mouse
| Matching Device ID: *pnp0f03
| Service: i8042prt
| 
+ HID-compliant mouse
| Matching Device ID: hid_device_system_mouse
| Service: mouhid
| 
+ Terminal Server Mouse Driver
| Matching Device ID: root\rdp_mou
| Upper Filters: mouclass
| Service: TermDD