Article ID: 955500 - View products that this article applies to.
When you try to install an instance of Microsoft SQL Server 2005 on a computer that has an instance of Microsoft SQL Server 2008 already installed, you may receive the following error message:
An instance with the same name is already installed on this computer. To proceed with SQL Server Setup, provide a unique instance name.
This problem may occur if one of the following conditions is true:
To work around this problem, use a unique name when you install SQL Server 2005 as a named instance.
For more information about instance configuration, visit the following Microsoft Developer Network (MSDN) Web site:
Article ID: 955500 - Last Review: March 19, 2009 - Revision: 2.0