Operating system makes more of a difference than most people realize, specially with ram. Windows XP 32bit edition, will only make use of 3GB's of ram, and thats only after you change some compicated settings.. I think in the registry.. I don't remember exactly how I did it, I'll find a link and post it. So right there, thats 1gb, maybe even 2gb's of your 4 that aren't even being utilized.
I also don't remember the limits for each version of windows XP and vista..
Maybe someone else can confirm?
Edit, found and copied this from
http://msdn.microsoft.com/en-us/library/bb613473(VS.85).aspx
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