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SQL Server Installation, an instance with the same name is already installed on this computer,

Tuesday, 31 July 2012 11:32

Written by Prakash Palani

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During SQL Server Installation, you may get an error saying “An instance with the same name is already installed on this computer. To proceed with SQL Server Setup, provide a unique instance name.” Below suggestions may help you take necessary steps to overcome the mentioned error.

 

Below are the few reasons and solutions which can help you with the above mentioned error

 

Reason # 1: An instance is already installed

 

Solution : Install a Named Instance with Unique Name

 

Reason # 2: Previous uninstallation was not successful

 

Solution : Use the Windows Installer Cleanup Utility (MSICUU2.EXE) / MS KB 290301 to cleanly uninstall the SQL Server Software (then proceed with the installation)

 

Reason # 3 : Previous installation was successful, but the registry entries are not cleaned even after running the Cleanup Utility

 

Solution : regedit, HKLM -> Software -> Wow6432Node -> Microsoft -> Rename/delete Microsoft SQL Server Entries, then start with the installation.

 

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SQL Server Installation, an instance with the same name is already installed on this computer,