If you are sure that the add-in comes from a trusted source, click Enable Macros, and then click Close. In the Add New PowerPoint Add-In dialog box, browse for the add-in that you want to add, and then click OK.In the Add-Ins dialog box, click Add New.In the Manage list, click PowerPoint Add-ins, and then click Go.To add the add-in in PowerPoint 2007, follow these steps:

In the Available Add-Ins list, select the add-in that you want to remove, click Remove, and then click Close.

In the Manage list, select PowerPoint Add-ins, and then click Go.

Click the Microsoft Office Button, click PowerPoint Options, and then click Add-Ins.

To remove the add-in in PowerPoint 2007, follow these steps: Click Add New, select the add-in, click OK, click 'I AGREE' to load the add-in, and then click Close.In the Available Add-Ins list, click the add-in, and then click Remove.To remove and add the add-in in PowerPoint 2002, follow these steps: To work around this issue, clear the cached information, and then load the add-in by following either of the following methods after you change the macro security-level setting. PowerPoint cannot load the add-in after you lower the macro security level until it clears the cached information. When you attempt to open an add-in file, and the add-in is not loaded because of macro security, PowerPoint temporarily stores (caches) the failure-to-load information about this add-in. You open the same PowerPoint add-in file by using the Open command on the File menu.You lower the macro security-level setting.You attempt to open a PowerPoint add-in file by using the Open command on the File menu while the macro security level is set to High.This behavior can occur if the following conditions are true: PowerPoint couldn't load the add-in file name. The add-in is listed as an available add-in in the Add-Ins dialog box, but the check box is not selected, and you receive an error message similar to the following when you attempt to select the check box: When you lower the level of macro security in Microsoft PowerPoint, and then open a PowerPoint add-in file (*.ppa), the new level of macro security may not be applied, and the add-in file may not run as expected.

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