1. Farcry 2
2.Hitman: Bloodmoney
3. Assasins Creed
4. Call of duty 4: Modern Warfare
5. Silent Hunter

Its been long since I have played games and the last one I played was San Andreas. Since I would be between jobs for the next few days I would like to try one of those. Which one? please give reasons. Thanks. BTW, I have chosen only games which are compatible in my PC. So please suggest one game within the list.
My system Spec:

Intel Dual Core 2.4Ghz
2 GB RAM
250 GB HDD

So the new games will not work.