An instance with the same name is already installed on this computer

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Registry Keys:
Uninstall all SQL components possible in Add/Remove Programs (including the SQL client and VSS writer)
Stop all SQL Services and configure them to disabled using Start > SQL Configuration Manager
Delete the following registry to get rid of the services. If you have multiple instance installed, it will be Keyname$Instance (i.e. MSSQLServer$OFFICESERVERS)


HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSQLServer
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SQLServerAgent
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSQLServerADHelper
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ReportServer
Verify that the services do not exist in the SQL Configuration Manager.
Delete the SQL Configuration in the registry
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer
HKEY_LOCAL_MACHINE\Software\Microsoft\Microsoft SQL Server
Note - if you installed a 32 bit version of SQL on 64 bit version of Windows, you will need to also delete them from the 32 bit registry node that is redirected. More Info MS 896459.
* HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432node\Microsoft\MSSQLServer
* HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432node\Microsoft\Microsoft SQL Server
Delete the SQL Program files - Note this will also delete the existing databases on the system that must be restored from backup.
Delete the directory: C:\Program Files\Microsoft SQL Server
Note - if you installed a 32 bit version of SQL on 64 bit version of Windows, you will need to also delete them from the 32 bit program files:
C:\Program Files (x86)\Microsoft SQL Server
You might need to reboot to close all files before you can delete the directory.
Now you can reinstall a clean 32 bit or 64 bit SQL without errors.


Uninstall any .NET frameworks you have installed:
Install .NET Framework version 2.0.50215.312
Reboot - Even though you aren't prompted to reboot, you want to do it now, otherwise the SQL Server Express 2005 installer will fail saying that you have unfinished installations that need a reboot.
Install SQL Server 2005 Express