First, welcome to Aximsite!
Second, My X50v shows an "OK" button on the System Information screen, too. And, try as I might, I couldn't find any way to make the Navigation Bar disappear on any application. Could you have downloaded a utility that hides the Navigation Bar? That would actually be useful in some apps to gain some screen real estate, and I would be interested in knowing what it was.
Be sure to let us know what your issue was and how you fixed it.
Good luck! :approve: