^Generals and Zero will probably lag quite a bit.
Age of Empires I and II. May be able to run Fable:The Lost Chapters on low settings. Fallout I and II. Diablo I and Diablo II. Doom I and II. Wolfenstein.
Just google free online games.
I would say your best bet is to play those free online games. There are millions of them.
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You should really think about upgrading your RAM. 256 MB? RAM is very cheap.
