How to un install SQL Server 2005


You can use these docs for uninstalling your 2005 sql instance based on your requirement.


Uninstalling an instance of SQL Server 2005 manually
http://support.microsoft.com/?kbid=909967


Windows Installer Clean-Up Tool
http://download.microsoft.com/download/E/9/D/E9D80355-7AB4-45B8-80E8-983A48D5E1BD/msicuu2.exe


Uninstall SQL Server Management Studio
http://support.microsoft.com/default.aspx?scid=kb;EN-US;909953


Using the Add or Remove Programs item in Control Panel to add
or remove components for stand-alone installations and clustered
installations of SQL Server 2005 (KB: 922670)

http://support.microsoft.com/default.aspx?scid=kb;EN-US;922670


Uninstall SQL Server Express
http://msdn2.microsoft.com/en-us/library/ms143505.aspx


Fatal error during installation
http://support.microsoft.com/?kbid=919945


Uninstall Applications NOT in Install/Remove Programs List
http://blogs.msdn.com/astebner/archive/2005/10/30/487096.aspx