Trying to install SQL 2012 Developer Edition to a new Windows Server 2012 R2 (or Windows 8.1) machine I was getting an Unhandled Exception immediately after running the setup.exe.

Turns out this is due to a user.config file that gets created by conflicting versions of the .net framework as described in this Microsoft Article: http://support.microsoft.com/kb/2681562

Fortunately, there’s an easy fix:

Open this folder: %userprofile%\AppData\Local\Microsoft_Corporation\LandingPage.exe_StrongName_ryspccglaxmt4nhllj5z3thycltsvyyx\11.0.0.0

Delete the user.config file.

Re-run your setup and you’re good to go.

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