You have to buy or use a trial version of Photoshop CS5, CS5.5 or CS6.
Adobe camera raw 6.7 or 7.1 does not function with earlier versions of Photoshop, including CS4 and earlier which is the same as Photoshop version 11 and earlier.
There are other options to open the files including using Nikon's software that's is supplied with the D4. Also, you can use the Adobe DNG converter to make the NEF into a DNG file which I believe that you can then open in your old version of Photoshop CS3.
The DNG converter is available on Adobe's website. Of course, there is other software that can convert your NEFs into an easier to handle format including Aperture and Adobe Lightroom 4.1 which are less expensive than Photoshop though they do some of the same things.
Make sure you read the system requirements before you buy new software.