I followed the instructions at this address:
I followed the instructions to find my camera and nef file extension and it said to download the Camera Raw 4.6 for my windows Photoshop CS3. Worked like a charm. Thanks
Either update to Photoshop CS5 (and the many bennies of ACR 6.x) or download the free DNG Converter and convert your new raw files to DNG so that they can be opened in Camera Raw 4.6 in Photoshop CS3 (note, you REALLY want to update ACR to 4.6).
The Camera Raw plug-in for CS3 is older than the format your new camera puts out.
1. Check whether the latest update of Camera Raw for your version of Photoshop supports your camera. You do that by going to the Camera Raw updates page and seeing what major version of Camera is grouped with your version of Photoshop, then reading the ReadMe file for the latest update in that sequence. Keep in mind that Adobe stops updating Camera Raw for major version X of Photoshop when they release version X+1 of Photoshop.
2. If you find your camera is not supported by Camera Raw, then you need to understand Adobe offers a free DNG converter that, in its latest version (available on the pages listed above), will likely be able to open your raw files and convert them to DNG format files. In turn, your old version of Photoshop will be able to open DNG files
3. You need to make a decision: You can upgrade to the latest version of Photoshop that will just open the raw files directly, or you can continue to use your old version of Photoshop and open DNG files that you have converted from your original raw files.