So you have a PowerPoint 2007 update being offered up on boxes where only Office 2010 has been installed?

Check to see if you have Microsoft Office 2007 Primary Interop Assemblies installed.  If you do, remove it, as that’s what is flagging the update on your systems.

So … now you are probably wondering how do you have that?

Answer:  (at least in my office) is Quickbooks – I think 2010, maybe 2011 version — I’ll have to double check but it’s a more recent vintage that installed that.
Microsoft Office Components

Intuit Statement Writer (ISW) uses Office Primary Interop Assemblies and Visual Studio Tools for Office for Microsoft Office Integration. The installation file location on the CD is:
  • Office 2007: ThirdParty\MSOffice\vstor.exe
  • Office 2003: ThirdParty\MSOffice\vstor20\vsto.msi

So if you have been impacted where KB2596764 errors out with a generic 0x80070643 error?  And you have Office 2010 (and only 2010) installed?  See if you have a Microsoft 2007 Primary Interop Assemblies installed on your system and remove it.

Please note this will not impact exporting to Excel.  In fact I see no change in behavior
as a result of removing it, so I’m not sure what (if anything) it was used for.

If that DOESN’T fix you up, holler and we can get some support cases set up.  To holler email me at .


7 Responses to KB2596764 failing with a 0x80070643 [resolution]

  1. Alois says:

    I had the same problem. I removed “Microsoft Office 2007 Primary Interop Assemblies”. “Office 2010 Prof” was working again after using the “repair” function. Thank you Alois

  2. HappyUser says:

    Uninstalling ‘Microsoft Office 2007 Primary Interop Assemblies’ worked for me! Thx :).

  3. Jon Bielby says:

    I had the same issue on a machine with an Office 2010 install which previously only had the powerpoint 2007 viewer- that must have loaded the Microsoft 2007 interop assemblies? Uninstalled the 2007 interop assemblies and update installed successfully

  4. No Quickbooks says:

    This is a new computer, so I’m sure that the current Office 2010 is the only one that has been installed and we don’t use QuickBooks. However, we did have Quicken 2009 and now Quicken 2012 installed.

    Thanks for the tip – I noticed that, but wasn’t confident enough to remove it without seeing what someone else thought about it.


  5. Blazej says:

    Removing Office 2007 Primary Interop Assemblies works for me. System is Windows Server 2008 used as terminal server with Office 2010.

  6. Joe says:

    Thank you so much! I’ve had that error for the longest time, and never been able to figure out how to fix it. Uninstalling Office 2007 Primary Interop Assemblies from the Win7 Programs and Features menu in the Control Panel did the trick. Thanks again.

  7. wuhaiming says:

    error code:78F