HELP, upgrading computer for Crysis 2?

Here is everything I can provide about my system



Manufacturer: Hewlet-Packard Company

Model: p6650z

Operating System: Windows 7 Home Premium 64-bit

Processor: AMD Athlon II X2 250 (2 CPUs) 3.00 GHz

4.0 GB RAM (May upgrade to 5.0, room for up to 6.0)

ATI Raden HD 4200 (Is this my problem?)

525 GB free of 583 GB (I'm almost positive my hard drive is fine for Crysis)

Memory: 4096MB RAM

DirectX Version: DirectX 11



I BELIEVE my motherboard is N-Alvorix-RS880-uATX



http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02560084%26amp;tmp_task=prodinfoCategory%26amp;lc=en%26amp;dlc=en%26amp;cc=us%26amp;site=null%26amp;key=null%26amp;product=5033553



So my question is, what do I need to upgrade to play Crysis 2 on Med-Max graphics with 30-40 FPS? Instead of upgrading now, should I wait until I get a job so I can upgrade to higher quality PC parts?HELP, upgrading computer for Crysis 2?
You can minimize expense with a better vid card and 4 more gigs of ram ( 2 and 2). Make sure it matches what you already have. Do not upgrade to 5 gigs by sticking another piece of ram in an empty slot or your board will run in single channel mode, which is SLOW. The board you have will support up to 8 gigs of ram.HELP, upgrading computer for Crysis 2?
for better gpu u would need better cpu so u would need to upgrade ur motherboard, cpu, ram and psu and u want to play crysis 2 with med-high so that would cost around 400$

cpu: phenom 2 x4 970

mobo: some am3

gpu: hd 6850

ram:4gb of ddr3

psu:550w quality