The file may have been renamed, moved, or deleted. Microsoft PowerPoint Add-ins have a .ppa file name extension (to see the .ppa extension, you may need to turn on the display of extensions in Microsoft Windows). Add-ins are stored by default in one of the following places:
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The Library folder or one of its subfolders in the Microsoft Office/Office folder.
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The Documents and Settings/<user name>/Application Data/Microsoft/AddIns folder.
The administrator for your company's network can designate other locations for add-in programs. See your administrator for more information.
You can reinstall a PowerPoint add-in by using the program that you used to install PowerPoint. To find and load an add-in that isn't stored in one of the default locations, on the Tools menu, click Add-Ins, click Add New, and then locate and select the add-in you want to load.
If the add-in is stored on a network, check the network drive
The network drive may be unavailable. To ensure that you can use the add-in when your network is unavailable or your computer is offline, keep a copy of the add-in on your computer.
If you are working on a different computer, check your original computer
For the add-in to be available on other computers that you use, you must store it on your original computer in the Documents and Settings/<user name>/Application Data/Microsoft/AddIns folder. Check with the administrator for your company's computer systems for more information about working on other computers.
Check with your Office or PowerPoint administrator
Your administrator may have decided not to make the add-in available for installation. In this case, you may need to reinstall Microsoft Office or Microsoft PowerPoint. Check with your administrator for more information.