PC will not recognize a Nikon D90 camera connected via USB port.

Hi,

Let’s make sure that you have completely uninstalled Norton 360 from your computer. I have included a link which contains the removal tool for Norton 360. Install the tool and remove it completely from your computer. If you still face the same issue after removing Norton 360, I would recommend you to install it again and remove it using the removal tool.

http://www.symantec.com/norton/support/kb/web_view.jsp?wv_type=public_web&docurl=20071130124653EN

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Make sure you have installed the drivers for the camera. Follow the steps mentioned in the article below to do that.

Update a driver for hardware that isn't working properly
http://windows.microsoft.com/en-us/windows-vista/Update-a-driver-for-hardware-that-isnt-working-properly

If the above doesn’t help follow the link given below to fix the common USB issues.

Tips for solving problems with USB devices
http://windows.microsoft.com/en-us/windows-vista/Tips-for-solving-problems-with-USB-devices

Let us know if this helps

Regards
Sreekanth.