Twin, my Dxdiag looks almost identical to yours, but there are a few differences.
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System Information
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Time of this report: 8/23/2009, 19:38:59
       Machine name: DAD-XHD5FC9SIO0
   Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158)
           Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
       System Model: P5K-E
               BIOS: BIOS Date: 03/21/08 09:56:22 Ver: 08.00.12
          Processor:
 Intel(R) Core(TM)2 Duo CPU     E6850  @ 3.00GHz (2 CPUs)
             Memory:
 3328MB RAM          Page File: 
401MB used, 4809MB 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
Mine ID's the CPU, shows a bit more ram (believe you said you have 4 gig too?), and my page file is different. I'm sure I have more background stuff due to your being a fresh install, but my available is smaller. Not that I think any of this is a problem, just different.
The video is something that bothers me.... 
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Display Devices
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        Card name: NVIDIA GeForce 8800 GTS
     Manufacturer: NVIDIA
        Chip type: GeForce 8800 GTS
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_0193&SUBSYS_C8293842&REV_A2   
Display Memory: 640.0 MB     Current Mode: 1680 x 1050 (32 bit) (60Hz)          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: nv4_disp.dll
   Driver Version: 6.14.0011.7779 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 7/26/2008 14:48:00, 6047360 bytes
      WHQL Logo'd: n/a
  WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: nv4_mini.sys
    Mini VDD Date: 7/26/2008 14:48:00, 6097536 bytes
Device Identifier: {D7B71E3E-42D3-11CF-9145-22E803C2CB35}
        Vendor ID: 0x10DE
        Device ID: 0x0193
        SubSys ID: 0xC8293842
      Revision ID: 0x00A2
      Revision ID: 0x00A2
Same card, but look at the memory. That I think "might" be a problem. Hopefully one of the guru's around here can comment on that. I have everything cranked up and have no troubles at all.....other than my poor aim, but I doubt even HT could fix that  
