KB ID 0000958
I was installing SQL Server 2012 and suddenly this popped up;
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
I’ve been bitten by .Net on Server 2012 before. Leave this error on the screen, and the install in the background, and pop in the Sever 2012 Installation DVD, then run the following command;
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:sourcessxs /LimitAccess Where D: is the DVD Drive Letter
Put the the SQL Install media back in the drive if you removed it, (I was installing from a mounted .ISO file), click OK on the error message and SQL should continue to install.
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