That happened to me a while back after an update. I wound up having to go back to an older version of it. When I got my new refurb P/C in September I downloaded it and haven't had any problems or updated since. Now I know I won't update it. Let us know when you get it worked out.
So I ended up uninstalling view NX and re-installing the new version from The Nikon website. It is working fine now. I think mine was corrupt. It appears to just be a management program as all of my pics were still there .