Intel I7 920 / only one core is working (?) Any idea?

Hello all,
I have a problem with my rendering. when I render with after, only one of the core's works (picture).
working with:
windows xp pro sp3 en
adobe creative suit cs4
my pc:
intel core i7 920 2.67 GHz
memory: 3 gb ddr3 (667MHz)
card: Nvidia GeForce GTX 280 (1024 MBytes)
Any idea what is wrong? ..Or recommended settings for better rendering (?)

Dear Mylenium,
First of all, thanks for your quick reply on my previews post.
BUT, after reading a lot and watching the videos of Video2brain, I realized that everybody is talking about cs5. As I posted before... I have sc4. When I preview something in after ALL of my cores are working in order to render my preview. When I render my project things are different. Again I have the picture of 1 core rendering.
Can I do something about that? Or, if I wanna use all of my cores I have to upgrade to cs5?
Thank you in advanced

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Link to image 1
Link to image 2
Moderator note: large image(s) converted to link(s): About Posting Pictures In The Forums
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-
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