Do you have an Apple? What version of Lightroom are you using?
No I don't have apple, have Microsoft and have lightroom 5
According to Adobe's chart, you need Lightroom 6.0 or higher for a Nikon 5500. (https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html ).
Adobe provides a solution for those that prefer not to invest upgrades called the DNG Converter. ( https://helpx.adobe.com/photoshop/using/adobe-dng-converter.html ). It is free.
If you use it as part of your routine to copy files from your card to your computer it will make new RAW files in the Adobe DNG format from your Nikon RAW files. There is no loss to quality or features. Older versions of Adobe software will read the newer image files if they are in the DNG format.
Thanx alot!!! it worked!!!!
You are welcome and thank you for responding that it did work.