Installing the .NET 4.5 Full upgrade on a Windows Server 2008 R2 SP1 x64 system with SQL Express Advanced 2012 hangs. Apparently it tries to do something with the 4.0 Extensions pack installed by SQL. Repairing .Net 4.0 hangs too. The .NET 4.5 install log ends suddenly without error. The last thing in the log is something to do with SQL. The 4.5 install's Cancel button is grayed out. Killing the process after 24 hours of inactivity caused further installs to fail because the system thinks an install is still running. Fortunately this was on a test system so the impact was minimal, but our product installs are going to encounter this environment quite a lot. How can we resolve this so the .NET 4.5 upgrade runs smoothly?
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