Uninstall update KB2966827, KB2966828
Install .NET Framework 3.5 using CMD
dism /online /enable-feature /featurename:NetFX3 /source:D:\sources\sxs /all /LimitAccess
Install .NET Framework 3.5 using PowerShell
Add-WindowsFeature –name NET-Framework-Core -source D:\sources\sxs
Important: On Server 2012 R2 with Update 1 installed (KB2919355) this doesn’t work if you are using the original DVD/ISO. You need a DVD or ISO which includes that update. For new installations, install .NET 3.5 before you apply KB2919355