I installed the .NET 3.5 feature but I still get this error.
From the log.
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Feature: Database Engine ServicesStatus: Failed: see logs for details
Reason for failure: An error occurred during the setup process of the feature.
Next Step: Use the following information to resolve the error, uninstall this feature, and then run the setup process again.
Component name: SQL Server Database Engine Services Instance Features
Component error code: -2147467259
Error description: External component has thrown an exception.
Error help link: http://go.microsoft.com/fwlink?LinkId=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=11.0.2100.60&EvtType=0x987D2693%400xE8A9805D&EvtType=0x987D2693%400xE8A9805D