How to optimize for my rig?

[C-zom 10]

New rig, need new tweaks. I reinstalled Arma 2 so I have a fresh Arma2.cfg and user profile in my documents. I don't feel like reading over 60 pages of that (out dated) optimization topic, so can you guys tell me what tweaks I should make and where to make it run as best as possible without sacrificing too much visual quality?

1: What tweaks should I make to my text files in my documents?

2: What settings should I put in game?

3: How do I make this game use all my video memory and four cores?

4: Any fps mods out there that don't kill the quality?

Rig:

Windows Vista SP2 32 bit

Intel q9400 @ 3.1GHz

4GB DDR2 RAM 936MHz (Technically 3.5GB)

GTX 275 896MB

196.75 Drivers

[HyperU2 11]

Add a search feature.

[boomboomer 0]

Dump Vista for a start, go back to XP SP3 for an extra 10 fps.

[C-zom 10]

Vista is my favorite OS out of all three, having used all three extensively in different computers. Any real advice? If I reformat it'll be on a vista 64 disc.

[sick1 13]

No offense, but you will not be able to enjoy this game with Vista unless you don't mind the stuttering and poor frame rate. If you must have Vista, I would dual boot. I have windows 7 and xp on different partitions. Arma 2 is on a 40 gig partition using Xp and it runs smooth as butter(campaign also). The key is to def rag the hell out of it.

[Southern-16AA- 0]

No offense, but you will not be able to enjoy this game with Vista unless you don't mind the stuttering and poor frame rate. If you must have Vista, I would dual boot. I have windows 7 and xp on different partitions. Arma 2 is on a 40 gig partition using Xp and it runs smooth as butter(campaign also). The key is to def rag the hell out of it.

That's weird. I run it on Vista (64bit), with a worse pc than the op and I get no stuttering and my frame rate is just fine. Not a single optimization performed. Ok, I don't have the settings maxed, but I am running at 1920x1200.