1) Little Big Adventure.  Here's abandonia review:

 WOW…
How can I even start to describe this game? Well to be honest, I can’t. At least not just by playing it. To tell the truth I had to look around the net for various other reviews for this game. I needed to see if they managed to catch the magnificence of Little Big Adventure in their review, but no-one had even come close to give the game its justified glory. And I can understand why. This game is without a moment of doubt the BEST game to ever be released in 1994!  The French company Adeline fell apart a couple of years later...

http://www.abandonia.com/en/games/149/Little+Big+Adventure+-+Twinsens+Adventure.html

2) a X-COM that runs on windows 7

3) Birthright - The Gorgon's Alliance

is a Dungeons & Dragons campaign setting that was first released by TSR in 1995.The setting based on the world of Aebrynis on the continent of Cerilia, in which the players take on the role of the divinely-empowered rulers, with emphasis on the political rulership level of gameplay. In 1996, Birthright won the Origin awards for Best Roleplaying Supplement of 1995. Though it has a dedicated fan base, Birthright currently has no corporate support, unlike Forgotten Realms and Eberron.

The setting revolves around the concept of bloodlines: divine power gained by heroes and passed to their descendants. Characters with a bloodline create an aura of command known asRegency, which is measured in the game using regency points or RP. Using regency, characters acquire a domain composed of provinces and holdings. The development of these domains is as much a part of the game as development of the characters. The game uses three-month domain turns to model actions of rulers over nations in much the same way as Dungeons & Dragons (and hence, Birthright) uses combat rounds simulating six-seconds of time to model the characters' actions in battle.

During its four-year run, 25 roleplaying products and five novels were published by TSR, as well as a computer game by Sierra On-line. The line was suspended before the publishing schedule was complete. By the time Wizards of The Coast had cancelled the line after buying TSR. 

4) Abuse -  Platform shooter  by Crack dot Com

http://www.abandonia.com/en/games/97/Abuse.html

5) Dark Sun - The shattered Lands   by SSI (RPG in the wonderful world of Dark Sun)

http://www.thehouseofgames.net/index.php?t=10&id=249

I hope that I brought back good memories with all these games...I played the birthright computer game when I was 10 and it was a bit too complex for me.  However, I saw my brothers playing this game around a table with dice and it looked so awesome!  

You mean Emperor of the Fading Suns? That would be great, this game has great potential, but needs a better AI and other improvements.

Demigod

oh snap?

Jagged Alliance.

EDIT: And Dungeon Keeper.  And Mech Commander.

MOO 1 - a clash of the militaries game NOT an empire building game like Galciv- 

I echo everybody saying an X-Com type game. The new one being a shooter made me sad.

I too vote for the already mentioned Alpha Centauri, a vastly, vastly underrated game. Even though it had some issues with the AI, graphics and a horrible exploit, it was the perfect continuation of the Civilization franchise and it offered something no Civ-style game before and after did: an actual story and thoughtful, challenging ideas.

It was deeply philosophical and with its rather grim view on human nature also pretty scary. The videos for the secret projects were little artistic masterpieces and induced nightmares when I was younger. At the same time, they were quite inspiring and produced memorable quotes. Even nowadays when I watch some of these videos I feel uneasily inspired and am baffled as to how current they are/will become.

http://www.youtube.com/watch?v=iwqN3Ur-wP0

http://www.youtube.com/watch?v=iY57ErBkFFE&feature=related

http://www.youtube.com/watch?v=GBVCi0PmW24&feature=related

Have I already mentioned that this game is vastly underrated?

I always thought Alpha Centauri was a little miracle in the gaming world.

The atmosphere was incredible, perfectly conveying the feeling of being lost on an alien world, having to overcome environmental hazards, native wildlife, technological restrictions and the potential enmity of the other factions. Terraforming was literelly a (complex!) game within the game, giving you the freedom to alter the environment completely to fit your industrial needs, to alter it to build a green paradise on "earth", or even to adapt to it to the point of living immersed in the fungi. Or a combination of all.

The frank, un-idealized characterization of the leaders and their philosophies (not to mention the deepness and soundness of the quotes!), the perfectly logical intricacies and interconnections of the technological tree, the whole concept behind the world's setting... all made for a level of immersion that was, in my opinion, unprecedented and is still unparalleled.

Im defiantly for the X-com.  I still dont understand why someone doesnt just take the basic game and revamp it for today.  You could have a turn based feature or real time.  Could even throw in multi player by having friends able to jump in as your soldiers or what not.  Re do the tech trees and make them more modern and then add in alien tech and more.  I think if anyone could do it, its Lord Frog and his army of super duper game makers!!

The original Lords of the Realm.

Hmmm Damn, an Elemental mod would be nice if not.

Custer's Revenge.

After looking at the wiki.. some sick strange part of my self would like to see a remake of this game too.