How can I uninstall SQL Server Express from Windows Server 2008?

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http://serverfault.com – I installed Windows Server 2008 as my OS, but I dislike the SQL Server Express which it provided by default, so I changed to SQL Sever 2008 Enterprise. The problem is, I don't know how to remove the SQL Server Express edition. In Programs and Features under the Control Panel, I can't find the installation of SQL Server Express which was provided with the OS by default. I only see the SQL Sever 2008 Enterprise edition I installed. Any suggestions? (HowTos)