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On a freshly installed Windows Server 2008 R2 Standard SP1 I am installing SQL Server 2008 R2.

After configuring setup, install starts, but then it will hang on: Install_sqlSupport_KatmaiRTM_Cpu64_Action: InstallFiles. Copying new files.

What happens here? Why does the installation hang?

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As documented, SQL 2008 R2 requires at least .Net Framework 3.5 SP1 - the Windows Server-provided .Net 4.0 client profile is not sufficient.

Make sure you have installed the full framework, 3.5 SP1 or higher.

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Dang. And I read the message "needs .net and install thingies" at the start as "am going to install them if you click ok now". – Sam Aug 23 '12 at 12:54
It is at times like these that you are reminded that SQL Server is entirely its own product, and acts differently than most other Microsoft swag. – adaptr Aug 23 '12 at 12:55
Strange. .Net 3.5.1 already was installed as feature. – Sam Aug 23 '12 at 13:10
Can you include the relevant bits from the install summary file ? – adaptr Aug 23 '12 at 13:15
Am working on it. – Sam Aug 23 '12 at 13:17

Same issue. I had to verify .Net 3.5.1 was installed then Uninstall all Sql(Express) related programs and reboot. Afterward, Re-install succeeded. [it repeatedly failed until i uninstall Sql(Express)].

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