This game I played looked like the old Counter Strike. You could play as both police and terrorist. Had many maps and which I can remember now are:
1)Like a warzone with planes flying over you
2) An arctic kind of place when you play as terrorist you need to release an UFO.
3) Airport and there were some Hostages and you could give weapons to dhem and they will start Shooting the terrorist. And when you pased the metal detector an alarm sounds off and terrorrist comes for you.
And the last map i remember is like an Asian town with classic Chinese homes.
I Played this game on 2005 to 2007 or 8.
Sorry bad memory
And played it on a Windows Xp.
I Thank you all for helping me.