Alright here we go. Just got a Nvidia GeForce 8400 GS 512MB graphics board and installed. When I start AH, it opens to the first clipboard and when I click on offline mission it launches in to tower then freezes. The images outside the tower start out in block fashion and an error to the effect of NV4 blah, blah, blah is messing up   save all data then reboot.  Basically I can't launch into game
Here is a DXdiag:
------------------
System Information
------------------
Time of this report: 1/9/2009, 20:36:13       
   Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
           Language: English (Regional Setting: English)
System Manufacturer: MSI
       System Model: MS-7008
               BIOS: Version 07.00T
          Processor: Intel(R) Pentium(R) 4 CPU 3.00GHz (2 CPUs)
             Memory: 2048MB RAM
          Page File: 336MB used, 2327MB available
        Windows Dir: C:\WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.2600.5512 32bit Unicode
------------
DxDiag Notes
------------
  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
        Sound Tab 2: No problems found.
          Music Tab: No problems found.
          Input Tab: No problems found.
        Network Tab: No problems found.
--------------------
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 8400 GS   
     Manufacturer: NVIDIA
        Chip type: GeForce 8400 GS
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_06E4&SUBSYS_0A5E19F1&REV_A1
   Display Memory: 512.0 MB
     Current Mode: 1280 x 1024 (32 bit) (60Hz)
          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: nv4_disp.dll
   Driver Version: 6.14.0011.7824 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 11/4/2008 14:35:23, 6058112 bytes
      WHQL Logo'd: Yes
  WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: nv4_mini.sys
    Mini VDD Date: 11/4/2008 14:35:24, 6133856 bytes
Device Identifier: {D7B71E3E-45A4-11CF-D164-552A00C2CB35}
        Vendor ID: 0x10DE
        Device ID: 0x06E4
        SubSys ID: 0x0A5E19F1
      Revision ID: 0x00A1
      Revision ID: 0x00A1
      Video Accel: 
 Deinterlace Caps: n/a
         Registry: OK
     DDraw Status: Enabled
       D3D Status: Enabled
       AGP Status: Disabled
DDraw Test Result: Not run
 D3D7 Test Result: Not run
 D3D8 Test Result: Not run
 D3D9 Test Result: Not run
-------------
Sound Devices
-------------
            Description: Sound Blaster Audigy
 Default Sound Playback: Yes
 Default Voice Playback: Yes
            Hardware ID: PCI\VEN_1102&DEV_0007&SUBSYS_100A1102&REV_00
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: P17.sys
         Driver Version: 5.12.0001.0512 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: Yes
          Date and Size: 7/7/2005 02:14:30, 1389056 bytes
            Other Files: 
        Driver Provider: CREATIVE
         HW Accel Level: Full
              Cap Flags: 0xF5F
    Min/Max Sample Rate: 4000, 96000
Static/Strm HW Mix Bufs: 64, 63
 Static/Strm HW 3D Bufs: 64, 63
              HW Memory: 0
       Voice Management: Yes
 EAX(tm) 2.0 Listen/Src: Yes, Yes
   I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
               Registry: OK
      Sound Test Result: Not run
            Description: Bluetooth Hands-free Audio
 Default Sound Playback: No
 Default Voice Playback: No
            Hardware ID: 
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: btaudio.sys
         Driver Version: 5.01.0000.3200 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: Yes
          Date and Size: 3/22/2007 20:49:54, 539072 bytes
            Other Files: 
        Driver Provider: 
         HW Accel Level: Full
              Cap Flags: 0xB5B
    Min/Max Sample Rate: 48000, 48000
Static/Strm HW Mix Bufs: 1, 0
 Static/Strm HW 3D Bufs: 0, 0
              HW Memory: 0
       Voice Management: No
 EAX(tm) 2.0 Listen/Src: No, No
   I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
               Registry: OK
      Sound Test Result: Not run
I had a ATI 9200 pro in it before that was 128MB and wanted to get the most out of the hires pack. Please help 
