Recommend me games guys !

Hi guys topic says it all recommend me games my specs are !
i got 1.6 Dual core | with builtin Intel AGP G33/G31 Express Chipset | With 1 GB Ram
i am in a mood to play some games like GOD or first person shooter any game recommend me any game keeping in mind my specs
i know its not much for gaming but em in a mood to play some games on my weekend so i am not a big gamer so just suggest my any game i dont want new game just tell me any game which is a good fun to play !
waiting for replies with games
Answer #1
swat4 doom3 fear1+expansion
serious sam
hawx on low
grid on low
delta black hawk
dark sector on low
sniper elite
Answer #2
Halo Combat Evolved.