Tpl2000's Journal: what OS?

As of late, I've been despising Vista with every fiber of my being. I've only got it because it came with my laptop, which I got because it has 2gb of ram, 120gb hard drive, decent everything, and it was $600. best computer I've ever owned, in other words.
Well, that is to say, unless it had Vista.
I've even set it to the lowest grade possible, and I still can't push more than 10 FPS on WoW in Orgrimmar, or less than 5 in a battleground. I can push 30 FPS in an instance, but that's only--ONLY--because it's separated from the rest of the world. Granted, it's a laptop, but it's still really frustrating.

So, i'd like to ask all of you (and i wish i could make a poll of this, or if i can, i wish i knew how)

What OS should I replace Vista with? Is it even possible to do that without crashing my system due to soon-to-be-unforeseen-circumstances?

I'd prefer that i got over 20 FPS constantly in WoW.

here's my system:
manufactured by:HP
model: HP Pavilion dv2000
processor: AMD Turion 64 x2 1.80GHz
Memory(RAM) 1982 MB
System type: 32-bit Operating System
Display adapter:NVIDIA GeForce Go 6150

Thanks.