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Wickipedia offers a list of completely free action games from ligitimate game makers. All the games can be downloaded immedaitley and, like I said, they are completely free!
Lots of games you can play online ... mostly small flash games. Try http://www.miniclip.com to play some games.
Don't ask how to get commercial games fro free .
I tend to play some of the good shareware games out there. They are free to start but you need a key to unlock them after a certain point. They are usually pretty inexpensive after that. Spiderweb Software with the Avernum and Geneforge series, Apogee Software (DUke Nukem, etc.), and Ambrosia Software (EV Nova). Most of these groups release their older games for free. They are all virus and spyware free.
Another good source is Open Source projects on sites like Sourceforge, such as FreeCiv. I recently introduced my wife, who is a Civilization adict to FreeCiv so she can play it on her Linux box. She loves it.