Its a very simple scene to get crashes... are you using Poser content? If so try to remove one by one and render, somtimes I got error and crashes because Poser content in scenes. I have a big problem with my last image and could only finish it before get a new core2quad with 4 GB RAM.
Some people ask to defrag your HD and clean your temporary folders. Another tip that sometimes work is to delete your virtual memory file and let windows create  a new one.

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