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I'm trying to uninstall SQL Server 2008. I went through add remove programs and deleted all the SQL Server programs which didn't remove the services and the instances... I manually deleted the services using command prompt and I even tried deleted the SQL Server directories from program files and program files (x86).

I want to install SQL Server 2008 R2 so I can import data from a back up file from a db on another server. But when I try to install R2 it says the default instance is already being used. How do I get rid of the default instance from the original SQL Server?

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migrated from stackoverflow.com Sep 15 '11 at 0:42

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This was for 2008 R2 eval edition, but perhaps some of the same techniques would be useful for 2008: sqlblog.com/blogs/aaron_bertrand/archive/2010/10/25/… –  Aaron Bertrand Sep 14 '11 at 21:15
You might also try this: support.microsoft.com/kb/955404 –  murisonc Sep 15 '11 at 1:03

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