Arduino r3 port greyed out windows 10 pro

Hi, I just bought a arduino r3 starter kit. Installed on windows 10 pro. the ports menu is disabled. I tried to install the drivers from device manager without any success..Please see the device manager snapshot attached.
the board shows mega 16u22005th 2005ghe

could you please help.

(mod edit)

See the second link below as it may have information to help.
You might also need to enable "show hidden devices" in device manager.

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