That worked!  Dark Avatar and Twilight are up and running too.  Thanks - I would have been sad to see these go.

Now if only they would play nice without having to switch off SLI ...

Ok, recently upgraded to Windows 7 64 bit.  Downloaded Gal Civ II files through Impulse.  Initial game menu for twilight opens, but switching to full screen, program crashes.  Trying to emulate xp has not worked...

Here is the Debug file.

Debug Message:  Version v2.03 Twilight of the Arnor last updated on: Thu Jul 23 11:47:38 2009
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE SOFTWARE\Stardock\ComponentManager\Drengin.net\GalCiv2UL
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE SOFTWARE\Stardock\ComponentManager\Drengin.net\GC2EU
Debug Message:  Could not query reg key HKEY_LOCAL_MACHINE SOFTWARE\Stardock\ComponentManager\Drengin.net value named Serial No
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GalCiv2UL
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GC2EU
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GalCiv2UL
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GC2EU
Debug Message:  Checking DX Version.
Debug Message:  *********DXDiag info follows.*********
System Info
Time: 6/13/2010, 16:47:58
DirectX Version: DirectX 11
Machine Name: Computer
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.100226-1909)
Languages: English (Regional Setting: English)
System Manufacturer: Dell Inc.                
System Model: Dell DXG061                  
BIOS: Phoenix ROM BIOS PLUS Version 1.10 1.1.3
Processor: Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz (2 CPUs), ~2.4GHz
Physical Memory: 2048MB RAM
Page File: 1106MB used, 2984MB available
Windows Dir: C:\Windows


Display Info
Display device 1:
Device Name: \\.\DISPLAY1
Card Name: NVIDIA GeForce 7900 GTX (Microsoft Corporation - WDDM)
Manufacturer: NVIDIA
Chip Type: GeForce 7900 GTX
DAC Type: Integrated RAMDAC
Key Device: Enum\PCI\VEN_10DE&DEV_0290&SUBSYS_034310DE&REV_A1
Display Memory: 1271 MB
Current Display Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Max Resolution:
Driver Name: nvd3dumx.dll,nvd3dum,nvwgf2umx.dll, nvwgf2um
Driver Version: 8.15.0011.8593
Driver Date: 7/13/2009 21:41:53
DirectX Acceleration Enabled: Yes
 
Display device 2:
Device Name: \\.\DISPLAY2
Card Name: NVIDIA GeForce 7900 GTX (Microsoft Corporation - WDDM)
Manufacturer: NVIDIA
Chip Type: GeForce 7900 GTX
DAC Type: Integrated RAMDAC
Key Device: Enum\PCI\VEN_10DE&DEV_0290&SUBSYS_034310DE&REV_A1
Display Memory: 1271 MB
Current Display Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Max Resolution:
Driver Name: nvd3dumx.dll,nvd3dum,nvwgf2umx.dll, nvwgf2um
Driver Version: 8.15.0011.8593
Driver Date: 7/13/2009 21:41:53
DirectX Acceleration Enabled: Yes
 


Sound info
Sound device 1:
Description: Speakers (Creative SB X-Fi)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: PCI\VEN_1102&DEV_0005&SUBSYS_10031102&REV_00
Manufacturer ID: 1
Product ID: 100
Driver Name: ctaud2k.sys
Provider: Creative
Driver Version: 6.00.0001.1373
Driver Date: 6/4/2009 02:49:08
Type: WDM
Other Drivers:
Acceleration Level: 1
Cap Flags: 0
Min/Max Sample Rate: 0, 0
 
Sound device 1:
Description: SPDIF Out (Creative SB X-Fi)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: PCI\VEN_1102&DEV_0005&SUBSYS_10031102&REV_00
Manufacturer ID: 1
Product ID: 100
Driver Name: ctaud2k.sys
Provider: Creative
Driver Version: 6.00.0001.1373
Driver Date: 6/4/2009 02:49:08
Type: WDM
Other Drivers:
Acceleration Level: 1
Cap Flags: 0
Min/Max Sample Rate: 0, 0
 


Debug Message:  *********END dxdiag info.*********
Debug Message:  Entering WinMain
Debug Message:  ******* Starting Game Shell *******
Debug Message:  Could not query reg key HKEY_LOCAL_MACHINE SOFTWARE\Stardock\Drengin.net\GalCiv2 value named Language
Debug Message:  Going Fullscreen
Debug Message:  Preparing to change display settings.
Debug Message:  Using hardware vertex processing
Debug Message:  Using multilsample setting: D3DMULTISAMPLE_4_SAMPLES
Debug Message:  Attempting to create D3DDevice at resolution 1024 x 768, Windowed: 0, Multisample: 4
Debug Message:  Game Resolution: 1024 x 768
Debug Message:  Running fullscreen.
Debug Message:  HAL (hw vp): NVIDIA GeForce 7900 GTX (Microsoft Corporation - WDDM)
Debug Message:  D3DPRESENT_INTERVAL_DEFAULT
Debug Message:  Refresh rate: 60
Debug Message:  Bit Depth: 32 bit.
Debug Message:  *********Checking D3DDevice Caps***********************
Debug Message:  A full-color cursor is supported in hardware at high resolution modes.
Debug Message:  RGB in format 6:6:6, Masks reported as ff0000:ff00:ff
Debug Message:  Now Fullscreen
Debug Message:  Shell initialization complete
Debug Message:  GalCiv2 is activated.
Debug Message:  ***** Initializing Game *****
Debug Message:  Timer Frequency is 0 23acc4
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GalCiv2UL
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GC2EU
Debug Message:  No files found matching mask C:\Program Files (x86)\Stardock Games\GalCiv2\./Data/ShipTemplates/\*.shipcfg
Debug Message:  No files found matching mask C:\Users\Roy\Documents\My Games\GC2TwilightArnor\ships\*.shipcfg
Debug Message:  No files found matching mask C:\Users\Roy\Documents\My Games\GC2TwilightArnor\shiptemplates\*.shipcfg
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE SOFTWARE\Stardock\ObjectDesktop\DesktopX
Debug Message:  Initializing sound card.
Debug Message:  initailizing bink
Debug Message:  No files found matching mask C:\Program Files (x86)\Stardock Games\GalCiv2\DarkAvatar\Movies\techs\*.bik
Debug Message:  No files found matching mask Movies\techs\*.bik
Debug Message:  No files found matching mask Gfx\Tutorials\*.bik
Debug Message:  No files found matching mask C:\Users\Roy\Documents\My Games\GC2TwilightArnor\Gfx\Movies\*.bik
Debug Message:  No files found matching mask C:\Users\Roy\Documents\My Games\GC2TwilightArnor\sfx\*.wav
Debug Message:  No files found matching mask C:\Users\Roy\Documents\My Games\GC2TwilightArnor\Music\*.mp3
Debug Message:  No files found matching mask C:\Users\Roy\Documents\My Games\GC2TwilightArnor\Event Music\*.mp3
Debug Message:  Create setup screens.
Debug Message:  Clear galaxy settings.
Debug Message:  Clear influence.
Debug Message:  Clear up laws.
Debug Message:  Clear first time events.
Debug Message:  Clear wonders and trade goods.
Debug Message:  Clear sector mapper.
Debug Message:  Set mouse.
Debug Message:  Set update timer.
Debug Message:  Error flipping back buffer to primary buffer.
Debug Message:  D3DERR_DEVICELOST
Debug Message:  Device lost
Debug Message:  Attempting to reset device.
Debug Message:  Device Validated. Attempting to restore resources.

Go to My Documents\My Games\GalCiv2 (or the DA/TA folders as appropriate), open the file prefs.ini, and make the following changes:

Change
DisplayWidth=1024
DisplayHeight=768
ColorDepth=32
Fullscreen=1

To
DisplayWidth=(Your desktop width)
DisplayHeight=(Your desktop height)
ColorDepth=32
Fullscreen=0

Then save the file and start the game.