You typically want to install your region-specific version of Nikon's software:
ViewNX v2.0.3 - Win & Mac (Nikon USA)
ViewNX v2.0.3 - Win & Mac (Nikon CA)
ViewNX v2.0.3 - Win (Nikon Europe)
ViewNX v2.0.3 - Mac (Nikon Europe)
Capture NX v2.2.6 - Win & Mac (Nikon USA)
Capture NX v2.2.6 - Win (Nikon Europe)
Capture NX v2.2.6 - Mac (Nikon Europe)