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I had installed trial version of SQL 2008 R2 on my machine with win 7 as OS. Today I uninstalled it since trial expired then I tried to install SQL 2008 express edition with Advanced services but I keep getting below error:

SQL Server Setup has encountered the following error Method not found Boolean Microsoft.SqlServer.Configuration.MsiExtension.MsiExtensionMetadata.get_IsSlipstreamOrPatch()

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migrated from Aug 25 '11 at 12:52

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You have to manually and completely un-install SQL Server first, as per this KB

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I also blogged about my frustrations with this.… – Aaron Bertrand Aug 25 '11 at 11:43
@Aron nice blog post. – Pramodtech Aug 26 '11 at 12:59

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