The subject say it all, as of today the mainstream support for SQL Server 2000 (SP4) and SQL Server 2005 (SP1) will be ended. That means for SQL Server 2005 service pack 1 there will not be any support and that can be obtained with a Custom Support agreement
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In the README.HTML for SQL Server 2005 Service Pack 2 there are install instructions that covers the uninstall procedures too: > 1.3 Uninstalling SQL Server 2005 SP2, Once SQL Server 2005 SP2 has been applied, it cannot be removed without uninstalling
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