Assistance Needed with Office 365 Installation on Windows 11 Home

Phạm Anh Lâm 20 Reputation points
2026-06-27T07:33:59.3166667+00:00

Subject: Assistance Needed with Office 365 Installation on Windows 11 Home

Dear Admin,

I recently uninstalled an older version of Microsoft Office and attempted to install Office 365 on my Windows 11 Home system. However, the installation process was unsuccessful, and I received an error message during the attempt.

I would greatly appreciate your guidance in resolving this issue. Please let me know if you require any additional details about the error message or my system configuration to assist further.

Thank you for your support, and I look forward to your response.

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Best regards

Microsoft 365 and Office | Other
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Answer accepted by question author
DaveM121 933.9K Reputation points Independent Advisor
2026-06-27T08:08:04.17+00:00

Hi, that error usually indicates there was previously a volume licence version of Office installed on the PC.

Please follow these steps carefully.

Click your Start Button, type regedit and hit Enter to open the Registry Editor.

Click View and make sure 'Address Bar' is turned on.

Paste this into the Address Bar at the top and hit Enter.

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office\16.0\Common

In left pane of the registry editor, expand the Common folder, there should be a sub folder named OfficeUpdate

Right click and delete the OfficeUpdate Key

Close the registry editor and restart (not shut down) your PC to apply the change.

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  1. Phạm Anh Lâm 20 Reputation points
    2026-07-03T09:51:59.8033333+00:00

    Dear Sir,

    Dear Sir, I did it before, but I forgot, thanks to you I remembered again.

    Thank you for your understanding and support.

    Best regards,

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