Why cant I enable my 3rd monitor in Win7 control panel

I am trying to connect and use a second external monitor thru the DP port on my laptop docking station with a DP to usb adapter. In the control panel the 3rd monitor is connected but greyed out. Advice anyone on how to activate and extend to this 3rd screen??
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More about enable monitor win7 control panel
  1. What model laptop do you have? Most laptops only support 2 displays. I have never heard of a displayport to USB adapter.
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