You must use the Role Management Tool to install or configure Microsoft. NET Framework 3.5 SP1

When you install SQL Server 2008 under Windows Server 2008 today, you encounter the following error:

You must use the Role Management Tool to install or configure the Microsoft. NET Framework 3.5 SP1.

Since encountered by the way or record, although feel no technical content is not difficult, sometimes it is necessary to develop a good habit. Keep track of the problems you encounter, the solutions you have, and the things you think about!

Open Server Manager, Check the ". NET Framework 3.5.1 Features (installed)" under "Features", as shown, and then follow the prompts to click Next until the installation is complete.

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You must use the Role Management Tool to install or configure Microsoft. NET Framework 3.5 SP1