How do I remove color noise?

I have an image saved as a psd file with a high amount of color noise resulting from shooting at a film speed of 800. I have created a layer for a face in the image and a layer for the inverse (the remainder of the image). Can I reduce this noise using a tool in PSE7? I have tried the color noise reduction filter on each layer, but it seems to have no effect despite my playing with the adjustment sliders. The ultimate print of this image will be about 16"x24".

Thanks for this solution... exactly what I am searching for...
many thanks again, cheers

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