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Unable to cast COM object of type 'Microsoft.Office.Interop.PowerPoint.ApplicationClass' to interface type 'Microsoft.Office.Interop.PowerPoint._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{91493442-5A91-11CF-8700-00AA0060263B}' failed due to the following error: Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED)).

I am unable to finding solution please any one help in this?

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    You must reinstall Office on that machine to fix the registry damage. – Hans Passant Jun 09 '15 at 12:08
  • Thanks for your response , i reintsalled office but getting same error – Mohan Reddy Jun 15 '15 at 10:31
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    It is the HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\TypeLib\{91493440-5A91-11CF-8700-00AA0060263B} registry key, any properly configured machine has it. Shove that machine out of a 4th story window to make it stop wasting our time. – Hans Passant Jun 15 '15 at 10:34
  • I had old 32 bit office installed, I installed office 365 and by default got the 32 bit version. I had to uninstall all of office and install the new 64bit version of office. – in need of help Sep 02 '19 at 06:20
  • @Hans Passant I have the casting problem described by the OP, running 64bit PowerPoint. I checked my registry as Hans described above, and 1) the registry key exists, and the path listed under `{91493...}/2.c/0/Win64` was `C:\Program Files\Microsoft Office\Root\Office16\MSPPT.OLB`. The file existed. I don't know how to solve the problem. My code used to work with 32bit office/PowerPoint, but now it works with Word but fails with PowerPoint. – Kevin Nov 19 '20 at 05:31
  • To be precise, my exception was TYPE_E_ELEMENTNOTFOUND, not TYPE_E_LIBNOTREGISTERED. – Kevin Nov 19 '20 at 05:38
  • @kevin did you solve this problem. If yes, how? – usernumber124153 Mar 05 '21 at 23:00
  • Sorry, I can't remember, it was so long ago. I know that I had to install and reinstall Office a few times to coordinate the 64bit 32bit apps on my machine. – Kevin Mar 06 '21 at 07:14

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