The first thing to check is to make sure your ViewNX2 program is up to date. Go get the most recent version from NikonUSA.com.
Alternatively, there is no reason you need to use ViewNX2 to transfer the files. Just put the memory card in a card reader, and use a file browser to copy the files over to your hard drive. There is also plenty of third-party transfer programs available. I am a big fan of the PC utility "downloader pro" by BreezeSys.com.