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Error message when you try to install an instance of SQL Server 2005 on a computer that has an instance of SQL Server 2008 already installed: "An instance with the same name is already installed on this computer"

Symptoms

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.

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Cause

This problem may occur if one of the following conditions is true:
  • The existing instance of SQL Server 2008 is a unique named instance. However, you try to install SQL Server 2005 as the default instance.
  • The existing instance of SQL Server 2008 is a named instance, and you use the same name when you try to install SQL Server 2005 as a named instance.

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Workaround

To work around this problem, use a unique name when you install SQL Server 2005 as a named instance.

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References

For more information about instance configuration, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn.microsoft.com/en-us/library/ms143531(SQL.100).aspx

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Keywords: sql2008relnoteinstallation, sql2008relnoteconfiguration, sql2008relnote, kberrmsg, kbbug, kbexpertiseinter, kbprb, kb

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Article Info
Article ID : 955500
Revision : 3
Created on : 4/21/2018
Published on : 4/21/2018
Exists online : False
Views : 106