The "Disable customizing browser toolbar buttons" current user setting should be configured correctly.
enabled/disabled
User Configuration\Administrative Templates\Windows Components\Internet Explorer\Toolbars\Disable customizing browser toolbar buttons
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Microsoft Tool: Security Compliance Manager (SCM)
Microsoft Baseline: Internet Explorer 8
SCM URL: http://go.microsoft.com/fwlink/?LinkId=113940
Microsoft Security Compliance Manager (SCM) Baselines and Settings Packs
Microsoft