You receive an "Another installation is in progress" error message when you try to install Office or start an office program

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Article ID: 236456 - View products that this article applies to.
This article may contain a link to the Windows Installer Cleanup utility (MSICUU2.exe). If you were directed to this article to solve a problem by using the Windows Installer Cleanup utility, please contact your software manufacturer for installation support on the product, or see the following Microsoft Knowledge Base article for steps to troubleshoot uninstallation issues with products that use Windows Installer:

2438651 How to troubleshoot problems that may occur when you install, uninstall, or upgrade a program on a Windows-based computer
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When you try to install Microsoft Office or to start an Office program, you receive the following error message:
Error 1500. Another installation is in progress. You must complete that installation before continuing this one.
When you click Retry, the message is displayed again. When you click Cancel, the installation stops.


Two or more instances of the Msiexec.exe service cannot be launched at the same time for two different products. One install or repair process must finish before the other process can be launched.


To resolve this issue, restart the computer.
For more information about similar messages, click the following article number to view the article in the Microsoft Knowledge Base:
822454 "ERROR_INSTALL_ALREADY_RUNNING" error message when you run the Setup program to install Office programs


Article ID: 236456 - Last Review: June 19, 2014 - Revision: 7.0
Applies to
  • Microsoft Office Professional Edition 2003
  • Microsoft Office Basic Edition 2003
  • Microsoft Office Small Business Edition 2003
  • Microsoft Office XP Developer Edition
  • Microsoft Office XP Professional Edition
  • Microsoft Office XP Small Business Edition
  • Microsoft Office XP Standard Edition
  • Microsoft Office 2000 Developer Edition
  • Microsoft Office 2000 Premium Edition
  • Microsoft Office 2000 Professional Edition
  • Microsoft Office 2000 Small Business Edition
  • Microsoft Office 2000 Standard Edition
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