.net Framework 3.5 (NetFx3 ) error while installing SQL Server 2012

TITLE: Microsoft SQL Server 2012 Service Pack 1 Setup
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The following error has occurred:

Error while enabling Windows feature : NetFx3, Error Code : -2146498298 , Please try enabling Windows feature : NetFx3 from Windows management tools and then run setup again. For more information on how to enable Windows features ,
see http://go.microsoft.com/fwlink/?linkid=227143

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft%20SQL%20Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=11.0.3000.0&EvtType=0x681D636F%25401428%25401

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BUTTONS:

OK
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Resolution:
Install net Framework 3.5 Features
NOTE: should have the OS CD mounted to CD ROM 

Server Manager -->Add Roles and Features-->Role -based-->.net Framework..
http://sqlblog.com/blogs/sergio_govoni/archive/2013/07/13/how-to-install-netfx3-on-windows-server-2012-required-by-sql-server-2012.aspx