Ever since I've had this smart phone I can't get my PC to full recognize it so I can easily swap files. My PC will charge it.

The details:

-I'm using Windows 7 Professional.
-The phone is a ZTE model Z820 android 5.1
-Connected by a micro USB to the PC's USB

When I look in the driver it's plugged into I click "update driver" but I keep getting the same error message on the PC, "Windows found the driver but encountered an error installing it."

So how can I update the driver or do I need to do something on the phone?

There's nothing wrong with the USB port as it'll work with other devices.