Should I upgrade My laptops ram?

I am thinking about upgradeing my laptops ram cuz the slow loading times of the apps and poor performance in WOW.

First would this help WOW, and for WOW all my settings are low :'( ?

And if I upgrade should I get 1 or 2gb of ram?

Some History-

-Hardrive has just been wiped

-has a fresh install of xpsvp 3

specs below tell me if you need more info

Pentium M processor 1.6ghz

DDR512mb ram

Its a thinkpad that works for word processing etc. I just wanna play wow on low-med setting, and where the image doesn't look like a old movie with all the chopiness.

Thx y'all