[Whiski]

Upgrading to a 64 bit is the first step. I ran CLoD in XP (never changed my system hardware) and the game ran with frequent CTD and stutters.

Once I upgraded to Win 7 Ultimate 64 Bit, no problems. Smooth gaming except for the occasional stutter online ( I do believe that may be server related) and most setting on high, no AA or SSAO in game but forced on in my nvidia CC.

Once you upgrade, you should see a considerable difference, due to Win 7 64 bit. Having DirX 11 helps as well as XP doesn't support DirX10 or 11 in my understanding.

Your system should run CLoD nicely.

My specs:

Gigabyte 770T
AMD Phenom II x4 955
Nvidia Geforce GTX 250 1 gig DDR3 x 2 (SLI)
12 Gb DDR3 Kingston Ram
SB X-Fi Titanium PCI Express

With my rig, which is mid range as well, I am getting a nice 30-45 FPS depending on were I am. Over London, my FPS drops to about 24-28 but still pretty smooth.

I am getting a new Vcard, was thinking about the Geforce 580 as I have heard it is really good.

Keep us informed of your progress.

Whiskey

PS:
EDIT: I should state my settings are all on medium except for Text quality, Model Detail, Visual Effects, Land Shading and damage model which are on high.