Checking your files, do you have all you need?
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Stardock Forums
Your GalCiv\GFX directory should have 112 files in it that are 45,770,425 bytes.
Your GalCiv\Data directory should have 19 files for 203,105 bytes.
Though this may vary slightly as my prefs.ini is 947 bytes
Your GalCiv\Setup directory should have 17 files for 4,445,263 bytes.
In the main GalCiv directory, the SDNetlib.dll should be from 7/15/2002 and be 81,920 bytes.
Your GalCiv\Data directory should have 19 files for 203,105 bytes.
Though this may vary slightly as my prefs.ini is 947 bytes
Your GalCiv\Setup directory should have 17 files for 4,445,263 bytes.
In the main GalCiv directory, the SDNetlib.dll should be from 7/15/2002 and be 81,920 bytes.