Adding a second screen

I want to add a second screen so I can see two different screens at the same time. The laptop is running on Windows 10.   I have an old screen with a 15 pin connection.  Purchased a 15 pin to HDMI adopter.  Windows 10 will not recognize the second screen.   In settings the display box displays "1/2" rather than "screen 1 and 2".
Should I be using a 15 pin to a UBS adopter instead or could it be that my screen is too old.
I would appreciate your input.   


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