This has been a drawn-out long term problem I have been not able to resolve for 6 months. Been using LR for 2 years, so I'm not a stranger to the program.
LR quit importing images off my SD card from my Nikon 3100 last December; using an Acer laptop, plenty of RAM and memory, running Win 8.1, originally purchased LR 5 software but have downloaded CC's version to no avail. No images will import; I have copied and pasted to a folder from SD card when images weren't recognized, in both NEF and JPEG format, onto my hard drive, I have brought images into PS, saved in a jpeg format, STILL will not recognize the files. I am reading there is a preference issue, if settings got wonky it was without my knowledge. I have read forums, checked YouTube, if there is a read and write setting that needs to be adjusted, I am NOT seeing that resolution posted anywhere. Very frustrated, as I need to get work done but tired of fighting this every time I open the program.
What is the destination folder into which you are trying to import the images?
Do you have Write permissions set on that folder?
You have a file permissions problem on your destination drive or its folders.
In the LR Import dialog, open the Destination panel and make sure it points to where you expect it to.
Using Windows File Explorer, navigate to the destination folder and verify that you have READ and WRITE permissions to that folder and its parent folder.