Hi, the easiest way is to turn off the notification: Type Notification Area Icons into the Start Menu search box, then click on the result and set GWX to Hide icon and Notifications > OK.

There is a lot of discussion on various websites (easily found by doing a search) about how to remove all traces of Win 10, which generally involves uninstalling numerous Win 10 updates, but going into that, is beyond the scope of this forum.

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What is c:\Windows\System32\GWX\GWX.exe? « Remove Adware http://greatis.com/blog/what-is-gwx-gwx-exe

Open the Windows Updater program. In the middle of the page, press the View Update History link. Look for KB 3035583 and delete it.