Hello, as stated on this page: http://kb2.adobe.com/cps/407/kb407111.html the first version of Camera Raw that supported the NEFs of the D3000 is 5.5.
Unfortunately, it is not compatible with CS3. You should use Camera Raw 4.6, Win | Mac and convert the NEF to DNG files with the DNG converter: (Windows® | Mac OS) more info: http://www.adobe.com/products/photoshop/extend.displayTab2.html
And just to clarify, 4.6 will work with CS3 right.
I appreciate the help PECourtejoie and Noel!
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Why doesn’t my version of Photoshop or Lightroom support my camera?: http://adobe.ly/ACRandDNG
The article above explains everything and has a video on how to use the DNG coverter.