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"

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Article ID: 955500 - View products that this article applies to.
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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.

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.

WORKAROUND

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

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

Properties

Article ID: 955500 - Last Review: March 19, 2009 - Revision: 2.0
APPLIES TO
  • Microsoft SQL Server 2005 Compact Edition
  • Microsoft SQL Server 2005 Developer Edition
  • Microsoft SQL Server 2005 Enterprise Edition
  • Microsoft SQL Server 2005 Enterprise Edition for Itanium-based Systems
  • Microsoft SQL Server 2005 Enterprise X64 Edition
  • Microsoft SQL Server 2005 Express Edition
  • Microsoft SQL Server 2005 Express Edition with Advanced Services
  • Microsoft SQL Server 2005 Mobile Edition
  • Microsoft SQL Server 2005 Standard Edition
  • Microsoft SQL Server 2005 Standard X64 Edition
  • Microsoft SQL Server 2005 Workgroup Edition
Keywords: 
sql2008relnoteinstallation sql2008relnoteconfiguration sql2008relnote kberrmsg kbbug kbexpertiseinter kbprb KB955500

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