I am using Potoshop Elements 7.0 and I just downloaded the latest camera raw (5.2). However, both with the old and new camera raw plug when I import black & white pictures from my Nikon D80 in NEF format I see them as colour pictures in the PSE organizer. How can I keep the original format (black and white in this case) while importing the pictures?
Your images are indeed color pictures. That's their original format. When you think you're shooting B&W, the camera built-in software just adds a flag for the camera manufacturer's raw converter to render them as B&W. ACR (Adobe Camera Raw) ignores that flag and leaves it up to you to convert the images to B&W through the method of your choice.