Make sure that you have the original usb cable that came withe the camera.
Due to recent security updates to the Windows operating system and virus protection programs interfere with the camera connections. I have seen many cases where the connection worked one day and would not work the next. Some manual set up may be required to get the camera to connect, even with the new software. See Below
First, restart you computer. Then with the camera on and connected with the usb cable, press the playback or review button on the camera and go to [Start] control panel, ( In Windows 7 select show all options) scanners and cameras and try to connect through the wizard. If unsuccessful, the last place to look is in the device manager. Go to back Control Panel, double click the System icon and select Device Manager. Under the heading Imaging Devices you should find the camera, possibly with a yellow triangle with an exclamation point. Click on Imaging devices (the words will highlight), then go up and click on Action and select "scan for hardware changes". The camera may then appear under the heading. You can also delete it and allow the computer to try to provide the correct driver. If you are try to use the Nikon software, open the program and try to connect.While not the most popular suggestion, this one depending on your computer configuration may be the only way around the problem and photos may need to downloaded as follows.
As an alternative, because of multiple compatibility issues with the camera connections and current operating systems, my other suggestion is to get an inexpensive usb memory card reader. You can take your memory card from the camera and plug it into the computer. The card will show up as a removable drive in "My Computer" and you can copy the photo files to a folder on your hard drive and view and print them from Windows or even transfer them from the card into the Nikon software. Personally, I prefer this method due to the simplicity and reduced wear and tear on the camera.
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well.
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Forgive me. I was unaware that you had "upgraded" to Windows 10.
Because the OS Windows 10 upgrade is brand new, no one has figured out a fix yet for it's inability to connect to anything other than the most basic stuff, therefor, the fastest an easiest way to accomplish what you are trying to do is get an inexpensive USB memory card reader. You can take your memory card from the camera and plug it into the computer. The card will show up as a removable drive in "This PC" and you can copy the photo files to a folder on your hard drive and view and transfer them from the card into any compatible camera software. Personally, I prefer this method due to the simplicity and reduced wear and tear on the camera. It is my experience that with the level of cooperation between them, it will take weeks for camera companies (Nikon included) and Microsoft come up with any reasonable solutions for direct camera to computer connectivity. Pleas refer to the links below:
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The operating system is still basically untested for everyone other than first adopters, but it is actually, the Security updates that cause the problem. While many people never have an issue, due to their system's unique configuration, this is a problem that has shown up, a lot, for different camera brands through Windows 7 and 8. Generally, as soon as enough people complain about the update's effect on connectivity, Microsoft will send a patch.