time-limited VBA PowerPoint macro

I require a macro written in VBA PowerPoint 2007 and 2010. Please note this is not [login to view URL] addin. Core function of the VBA is to display an XML ribbon menu and after a given period of time hide the ribbon menu. I would presume (but would welcome suggestions) that after the add-in is loaded the registry is written to and the VBA would check against the registry entry and after a given number of days disable the XML ribbon menu. Upon expiration and after hiding the ribbon menu (or disabling it) a user form would be shown with a custom message. I do understand this can easily be bypassed by somebody adjusting the registry entry but this is not concern me. I would also like whilst the ribbon menu is shown an additional icon that would show another user form showing how many days remaining until the expiration and within this user form a hyperlink can be clicked on the user would be taken to an external website. I hope this provides an overview and would welcome any questions.