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Use the Crucial system scanner tool http://www.crucial.c...ner/?click=true this will give you the information you need, there is no need to purchase from there just write down the recommendations and then shop around for the best deal.
You'll need to figure out if you're running 64 bit windows as well, otherwise it is useless to put more RAM in it as I believe 32 bit only recognises and uses up to 4GB. (Correct me on this if I'm wrong )