Open ‘Control Panel’ (Classic View);
Open ‘Taskbar and Start Menu’;
Click ‘Notification Area’ tab at top;
At the top of this window, be sure “Hide Inactive Icons” is checked, then select “Customize…” to the right of this check box;
Under ‘Current Items’, select “Sync Center”, the click the drop-down and select “Hide”
Click “OK” - “Apply” - “OK”
Then close Control Panel

Done!