Could not load file or assembly 'Microsoft.Office.Interop.PowerPoint' or one of its dependencies. This applies to Office 2010
Cause: The PowerPoint Interop assemblies have not been installed. The interop .dll’s are not distributed with the OptionPower, they are part of the Office install.
Solution:
Go to Control Panel\Programs and Features
Click Microsoft Office and click Change, click Add or Remove Features
Click the plus sign for Microsoft Office PowerPoint and make sure .NET Programmability Support is set to “Run from My Computer”, if not install the feature.
Click the plus sign for Office Tools, click the plus sign for Microsoft Graph and make sure .NET Programmability Support is set to "Run from My Computer"
You may also download the Interop files from Microsoft
Download: http://www.microsoft.com/en-us/download/details.aspx?id=3508