Origin has been offering free PC games for a while now. They are full versions, and the older games I believe have been modified to run on newer versions of Windows. I have Win 7 64 bit, and every game I've downloaded has worked perfectly.
Here are some of the games I've downloaded: Battlefield 3, Peggle, Plants vs Zombies, Sim City 2000, Dragon Age Origins, etc.
They are currently offering Command & Conquer - Red Alert 2, and the Yuri's Revenge expansion. I've never played any of the Command & Conquer games before, but the game is pretty fun so far.
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