Unfortunately, GALCIV and its variations won't run on Windows 7, 64-bit.
Funny thing though - I guess they felt it wasn't important to warn customers.
The game is addictive - I've had it running on a number of machines over the years. I have paid for and played the expansions heavily. One of the reasons I upgrades my hardware to a kick-ass system form Dell was so I could play the game with all of the video elements running.
When it came time to reinstall, I had a hell of time recovering my password through impulse. It took 4 tries, and an email to their offices. INstalled Impulse, logged in and waited for it to install.
The nothing. Tried everything, searched all of the boards, and unfortunately there's no solution to 64 bit Windows 7.
I have not given up on Stardock - I'm downloading sins right now as they claim it will run. But I will miss my favourite game.