Introduction: Nuke Windows 10 Upgrade Prompt
Step 1: Right Click Taskbar > Properties
Right-click in the middle of the taskbar at the bottom of the screen (not inside system tray at bottom right).
Step 2: Click "Customize"
Step 3: Hide the Prompt
This is where you can select an icon that appears and choose to hide it. Find the Windows 10 prompt and select "hide" from dropdown menu.