I can open NEF files with Elements 9, just make sure that your Camera Raw plugin is up to date.
Nikon View NX2 is a free download and should have been supplied with your camera. It is great for NEF processing.
It uses the same algorithms as Capture NX2 but does not have all the extra adjustments so it is more efficient and therefore faster.
It has
Exp comp
WB
Picture Control
Sharpness
Contrast
Brightness
Highlight Protection
Shadow Protection
D Lighting
Colour booster
Crop
Straighten
Auto Red Eye
Axial CA
Auto Lateral CA
You can also edit metadata, batch process etc.