Nikon has released NEF Codec version 1.12.0 that provides support for 64-bit Windows Vista and Windows 7 operating systems as well as the new Nikon 1 J1, Nikon 1 V1 cameras. The new version can be downloaded from Nikon Imaging website. It is a 90MB download. A system reboot is required to finish the installation.
The 64-bit support has been long overdue. Previously users of 64-bit system had to use third-party solutions.