1) Install wine.
sudo apt-get install wine1.2
2) Get wine tricks from http://wiki.winehq.org/winetricks
3) Install following software using winetricks. (I am not sure if all software are required or not but i did it anyway)
type winetricks on command prompt and then select following component.
Now you system is ready to install windows games. Once you installed game and is ready to rum the game.
Open terminal and type following command.