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I'm trying to install SQL Server 2008 Enterprise on Windows 7 Enterprise.

When I run setup.exe from the English/SQL2008/Enterprise folder, I get an error box titled pcaui.exe - System Error containing the text:

The program can't start because RockallDLL.dll is missing from your computer.

What file is that and where can I get it?

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This should be migrated to Server Fault, but this might help:… – KCotreau Jul 20 '11 at 0:31
@KCotreau This will most likely get closed on SF. Questions about SQL on desktop editions of Windows usually either get migrated here or closed as off-topic. – squillman Jul 20 '11 at 0:41
@squillman I see your point, but the real issue is not the OS. – KCotreau Jul 20 '11 at 0:44

SQL Server 2008 Enterprise on Windows 7 Enterprise

That's specifically not a valid option. SQL Server (except Developer, Express and Compact) requires Windows Server.

Developer has all the capabilities of Enterprise, but is limited (in the license) to "development and testing" use.

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