Forum:PC specs help

BF3 PC building/ specs help
Hey guys and girls (and other things),

I am a somewhat newcomer to battlefield and pc gaming. I use a pre built hp pc, wiith the only difference being i shoved a cheap graphics card in. I was able to run cod4, mw2, and bc2. however bad company 2 ran slowly at the lowest settings. I want to play bf3 smoothly so what do i need to upgrade:

Specs: something i noticed, is that when i went to that one website that sees if your computer can run a game (blanked on the name) is that it said i had only 2 gb of ram
 * ACPI 64x - based computer
 * NVIDIA Geforce 8400 GS
 * Pentuim(R) Dual-Core CPU 85200 @ 2.50 Ghz (in my DM, it says two of these, what does that mean??)
 * 64 bit Vista SP2
 * 5.00 GB Ram

I was given an invite to the bf3 alpha, but it wouldnt run because it said my graphics card was not up to min specs (275.33 it said is what i had, but that isnt high enough i guess)

i only have about 200 USD, any suggestions would be nice.

if its too expensive i will just have to go back to xbox, which would suck.

thanks anyway