The following requirements are based off of NCsoft testing. The bare minimum requirements are as followed:
CPU: Intel Quad Core or AMD Phenom II X4 more
Memory: 4GB or more
Graphics Card: Nvidia Geforce 8800GT or AMD Radeon HD4850 or more
Hard disk capacity of 22GB or more
Operating System Windows XP SP3, Win7 (64bit)
If you have newer or better parts you will not have a problem in running the game.