I'm running AH at 1920x1080, with 1024 textures, detailed terrain and water off, and anti aliasing off, getting 45-60 fps.  Decided to turn on some anti aliasing and see if it would make a difference in my frame rate.  So I go into video settings, move the AA slider to the right (any amount, it does the same thing) and click OK.  Instantly when I click OK I get the windows pop up "aceshigh.exe has stopped working" "check online for a solution" "close the program"  doesn't matter which option I click it just closes down AH.  Any thoughts.
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System Information
------------------
Time of this report: 11/1/2009, 12:15:50
       Machine name: KIRK-PC
   Operating System: Windows Vista™ Home Premium (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.090805-0102)
           Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
       System Model: EP45-UD3P
               BIOS: Award Modular BIOS v6.00PG
          Processor: Intel(R) Core(TM)2 Quad CPU    Q8200  @ 2.33GHz (4 CPUs), ~2.3GHz
             Memory: 6142MB RAM
          Page File: 1413MB used, 11076MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 10
DX Setup Parameters: Not found
     DxDiag Version: 6.00.6001.18000 64bit Unicode
------------
DxDiag Notes
------------
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
        Sound Tab 2: No problems found.
          Input Tab: No problems found.
--------------------
DirectX Debug Levels
--------------------
Direct3D:    0/4 (retail)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
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_82BC1043&REV_A1
   Display Memory: 2538 MB
 Dedicated Memory: 492 MB
    Shared Memory: 2046 MB
     Current Mode: 1920 x 1080 (32 bit) (60Hz)
          Monitor: Generic PnP Monitor
      Driver Name: nvd3dumx.dll,nvd3dum,nvwgf2umx.dll, nvwgf2um
   Driver Version: 7.15.0011.7516 (English)
      DDI Version: 10
Driver Attributes: Final Retail
 Driver Date/Size: 5/2/2008 20:16:00, 8113664 bytes
      WHQL Logo'd: n/a
  WHQL Date Stamp: n/a
Device Identifier: {D7B71E3E-45A4-11CF-C372-B6A200C2CA35}
        Vendor ID: 0x10DE
        Device ID: 0x06E4
        SubSys ID: 0x82BC1043
      Revision ID: 0x00A1
      Revision ID: 0x00A1
      Video Accel: ModeMPEG2_A ModeMPEG2_C ModeVC1_C ModeWMV9_C 
-------------
Sound Devices
-------------
            Description: Speakers (Realtek High Definition Audio)
 Default Sound Playback: Yes
 Default Voice Playback: Yes
            Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0885&SUBSYS_1458A102&REV_1001
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: RTKVHD64.sys
         Driver Version: 6.00.0001.5780 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: n/a
          Date and Size: 1/19/2009 23:12:54, 1699744 bytes
            Other Files: 
        Driver Provider: Realtek Semiconductor Corp.
         HW Accel Level: Basic
              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: No, No
   I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
            Description: Realtek Digital Output (Realtek High Definition Audio)
 Default Sound Playback: No
 Default Voice Playback: No
            Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0885&SUBSYS_1458A102&REV_1001
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: RTKVHD64.sys
         Driver Version: 6.00.0001.5780 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: n/a
          Date and Size: 1/19/2009 23:12:54, 1699744 bytes
            Other Files: 
        Driver Provider: Realtek Semiconductor Corp.
         HW Accel Level: Basic
              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: No, No
   I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No