Uninstall Named Instance of SQL Server 2005

I'm following these steps trying to Uninstall a Named Instance of sql server 2005 in one of our production environment, but get an error after set up runs it check.

Error:  The setup has encountered an unexpected error while setting internal properties. The error is: Fatal error during installation.

Question: To avoid this error, can I delete the named instance through the system registry HKEY?
                  HKEY_LOCAL_MACHINE----> SOFTWARE---->Microsoft------->Microsoft SQL Server
                  Uninstall Info

 Just delete the named instance from registry (MSSQL.4)?

Uninstall Steps:
•Login to the server with an administrator user account, or SQL Server 2005 service account.
•Stop all active SQL Server services in Services applet in Control Panel as any active connections may prevent the uninstallation process from finishing successfully.
•Go to Control Panel and then Add or Remove Programs applet.
•Search and verify that Microsoft SQL Server Setup Support Files appears in the list of installed programs. If it’s found, proceed to next step. If Microsoft SQL Server Setup Support Files component is not listed as one of the installed program, install the component by running sqlsupport.msi file locates in Servers\setup\ folder of the original SQL Server 2005 installation media, or disc, folder and USB flash drive that contains SQL Server 2005 setup files.
•Open command prompt (in Vista, use command prompt with administrator rights), and run the following command to uninstall the SQL Server components:

%ProgramFiles%\Microsoft SQL Server\90\Setup Bootstrap\ARPWrapper.exe /Remove

•Uninstall the SQL Server instance components such as database engine one at a time.
•Once the removal completes, repeat all of the above steps again until all the SQL Server components are uninstalled.
•Finally, uninstall the Microsoft SQL Server Setup Support Files component by using Add or Remove Programs (It should has been removed, but double check to ensure that).

What is the best way to accomplish this step without error?
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FavorableAuthor Commented:
Appreciate your response. Although, I had already gone through the uninstall process having microsoft support on the phone this afternoon. I just forgot to come in and delete the question.
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