Click the Office button, and then click PowerPoint Options.
![Click the Office button, and then click PowerPoint Options.](http://www.java2s.com/Tutorial/Microsoft-Office-PowerPoint-2007Images/Set_Addin_Security_Options___Click_Office_Button_And_Then_Click_.PNG)
Click Trust Center. Click Trust Center Settings.
![Click Trust Center. Click Trust Center Settings.](http://www.java2s.com/Tutorial/Microsoft-Office-PowerPoint-2007Images/Set_Addin_Security_Options___Click_Trust_Center_Click_Trust_Cent.PNG)
Click Add-ins. Select or clear the check boxes:
Require Application Add-ins to be signed by Trusted Publisher.
Disable notification for unsigned add-ins.
Disable all Application Add-ins.
![Click Add-ins. Select or clear the check boxes:](http://www.java2s.com/Tutorial/Microsoft-Office-PowerPoint-2007Images/Set_Addin_Security_Options___Click_Addins_Select_Or_Clear_Check_.PNG)
Click OK.
![Click OK.](http://www.java2s.com/Tutorial/Microsoft-Office-PowerPoint-2007Images/Set_Addin_Security_Options___Click_Ok.PNG)
Click OK again.
![Click OK again.](http://www.java2s.com/Tutorial/Microsoft-Office-PowerPoint-2007Images/Set_Addin_Security_Options___Click_Ok_Again.PNG)