That camera requires at least Camera Raw 7.4 which is only compatible with Photoshop CS6. You will either have to upgrade your Photoshop or use the latest DNG converter to create DNG copies of your raw files.
The latest version of ACR can not be use with old version of Photoshop like CS5. You need to use the latest DNG converter to create DNG versions of your D71000 RAW files. And use the latest ACR version CS5 supports to create RGB image by converting the DNG files you generated for your Camera's RAW files.