This is what I don't want:
Is there some way to make guest os fullscreen and scaled?
I'm using Virtualbox 5.1.2 with a Windows guest and an OS X El Capitan host.
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As per Manoj Sawai's youtube link (for visual guide)
The summary of what needs to be done:
Note: Although you have the full screen and view - some of the Windows Shortcut may not work (as it is intercepted by the Mac OS X)
If you want "true" full screen and Windows experience then you may want to consider bootcamp.