Replace [Product] with the name of the add-in you wish to uninstall. (for example Import/Export)
Start PowerPoint.
From the PowerPoint menu choose pptXTREME > [Product] > About
Click on the Uninstall button on the bottom of the form.
If you have more than 1 version of PowerPoint installed on this computer then click on Only Delete Menus and click Uninstall. If you have only 1 version of PowerPoint installed then click on Full Uninstall, click Uninstall, then goto step 6.
Close PowerPoint and repeat steps 1-5 for each version of PowerPoint installed on this computer.
Click the [Windows Start] button.
Click Settings>Control Panel.
Run the application Add/Remove Programs.
Click Install/Uninstall. Then select pptXTREME [Product] for PowerPoint from the list of applications that can be automatically removed.