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:
(http://support.microsoft.com/kb/2438651)How to troubleshoot problems that may occur when you install, uninstall, or upgrade a program on a Windows-based computer
When you try to install Microsoft Office or to start an Office program, you receive the following error message:
When you click Retry, the message is displayed again. When you click Cancel, the installation stops.
Error 1500. Another installation is in progress. You must complete that installation before continuing this one.
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.
For more information about similar messages, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/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