Error Code Portal
MicrosoftWindows Installer messagesError code

1931

MSI message 1931: The Windows Installer service cannot update the system file [2] because the file is protected by Windows. You…

Alternative forms: 0x0000078B · 0x78B

What does this code mean?

Code 1931 · An issue reported by Windows Installer messages.

Official explanation · Original text

The Windows Installer service cannot update the system file [2] because the file is protected by Windows. You may need to update your operating system for this program to work correctly. Package version: [3], OS Protected version: [4]

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Windows Installer Error Messages (for Developers) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

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