it runs extremely well on my computer which has a gig less ram than you do. however, you didnt mention the graphics card and a search on google yielded the result of an ati x700. i guess this would be the weak link, but it would generally run very well.
Vista aero will run flawlessly on ur system, both in terms of cpu/ram and gpu. It has been shown that aero runs on a gma950 and ati xpress 1100 well, which are integrated gpus. Ur 700 will run circles around those.