What to upgrade to play battlefield 3

Hello,

I have a standard Dell inspiron 540 computer not yet geared towards gaming, but I want to play battlefield 3. What I think I need to do is upgrade PSU, processor, ram, and graphics card. Am I missing anything?

My current specs:

Processor: Intel Core Duo E2160 / 2.2 GHz

Operating System: Windows 7 32bit

Mainboard: Chipset type Intel G33 Express

Ram: 2gb

Graphics: Integrated Intel graphics

Links to what I'm considering buying. Are these even compatible?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Thanks.