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Thursday, 21 December 2017

HOW TO FIX: 'Outlook requires Microsoft Outlook Express 4.01' error after upgrading to Windows 10 1709

HOW TO FIX: 'Cannot start Microsoft Outlook. Outlook requires Microsoft Outlook Express 4.01 or greater...' error when trying to start Outlook XP (2002) after installing the Windows 10 Creators Fall update (version 1709) or April update (1803)

This error occurs because of two missing registry keys:
  • HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{7790769C-0471-11d2-AF11-00C04FA35D02}
  • HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}
The error can be fixed by exporting and importing the missing keys from a working system or downloading replacements from the following links:
Once downloaded, double click the .reg file and proceed past the warnings by clicking 'Yes', 'Yes' and 'OK'.


  1. Hi,

    I just found your solution after having it found myself.

    If you like, take the files from my website:

    Your Reg File only works in 64 Bit Systems. I have integrated both 64 and 32 Bit Solution.

    The Wow6432 Node is for 32 Bit Apps in an 64 Bit Windows. For them, they appear as HKLM\Software instead of HKLM\Software\Wow6432Node.

    So for a 32 Bit System, just remove the \Wow6432Node.

  2. This comment has been removed by the author.

  3. It have been very helpfull. Thanks a lot

  4. My outlook express works now!! Thank you so much

    1. what do I click on to set up the email account in the next box after download the registry

  5. Took me a week trying all sorts of "solutions" to finally get here. Thank you very much, it worked for me!

  6. Took me just a little too long as well. Since the Outlook problem, I've got a crashing computer and it won't connect now either. . Sorry to ask, but I still have to recover documents and wonder how I can add these registry keys manually? Thank you!

  7. Save Link as and run - works like a champ!

  8. No joy. Downloaded and have run both edits. Verified changes via regedit. Still get error message. Do I need to reboot?



  9. Real joy. A reboot made outlook work. Next step is to recover the month of emails from the gmail store and leave the confusing world of em client.

    Many, Many thanks.

    This fix needs to be broadcast far and wide - there are so many forums that people have the same problem and no one knows about the fix.

  10. Thanks so much. I have not had use of my personal email for months as a result of Microsoft's forced update. I now have email again.

  11. Thanks for the fix!!!!! wonder if this fix will also work for the most recent Windows 10 upgrade version 1809?