Error Code Portal
MicrosoftWindows Win32Error code

1638

ERROR_PRODUCT_VERSION

Alternative forms: 0x00000666 · 0x666 · ERROR_PRODUCT_VERSION · 0x80070666

What does this code mean?

Code 1638 · An issue reported by Windows Win32.

Official explanation · Original text

Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.

Troubleshooting and diagnostic links

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

Source and terms of use

System Error Codes (1300-1699) (WinError.h) ↗

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.

Source details · Original licenses and notices