Get this
http://www.megaupload.com/?d=4F41ORNN,
If you don't know what that means then start reading here I have a laptop with a 2.8 -3.0GHZ core 2 duo and GT 240m, yes its old. I bought it specifically to play 2k9, 2k10, 2k11, and now 2k12. I max out 2k11 on my Asus N51VN-A1 but with AA on 4X and quality 3. Im sure its not any different this year and you should be on high after optimizing the config file and running D3dovverider.
The bottom line is i have the equivalent of the exact system requirements for the this game. It says 3.0GHZ dual core. I have t9600 at 3.1GHZ, not OC just what speedstep sets it to most of the time (yes intel turbo-boost is a glorified version of intel speedstep) The recommended GPU is a 3850 the GT 240m gets the same 3dmark06 score so it is just as powerful. Therefore my 2 year old $800 *at the time and new*, plays the 2k series sports games very well, along with source games.
To figure out if your hardware is the problem simply go to passmark or tomshardware and compare your hardware to the requirements in this case any computer with a 3dmark06 score of 7k or higher should be able to almost max out this game, provided they know what they are doing