Some time ago, I discovered that many of the games I played during my childhood are now freeware. Meaning: it's legal to pluck them from the internet. Although I usually still have the original games, this is not only easier, but the downloads have often been modified for XP and other modern operating systems. I'll post a list of my personal favorites. Feel free to do the same.
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System Shock 2
(
http://www.the-underdogs.info/game.php?id=3924 )
If you've never played this first person RPG before, you're definately missing out on something. It's quite similar to Deus Ex.
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UFO: Enemy Unknown
(
http://www.the-underdogs.info/game.php?gameid=4966 )
This is without a doubt one of the finest games in the history of the personal computer. In 'UFO: EU' (also known as UFO: Defender), you're in charge of an agency that protects the earth against alien incursions. You have to construct bases, capture aliens, research their technology and lead your men in battle.
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Transport Tycoon Deluxe (for windows)
(
http://www.the-underdogs.info/game.php?id=1631 )
There is more to this simple transport game than meets the eye. I played this day and night when I was young, and it still hasn't lost any of its charm. You're the chief of an all-round transport company. Build roads, airports and traintracks, and fill them with your own vehicles. Sabotaging the competition is optional.