Expression Blend 4 does not start after installing the NET Framework 4.5 Developer Preview

Over the last couple of days I have been trying out different combinations for app development on the Metro/WinRT platform and one of these involved installing VS 2011 Ultimate on to my main box that runs Win 7. Unfortunately Blend and the VS 11 Ultimate Developer Preview bits don’t play together out of the box. This is a known issue, and following the steps below will fix the issue.

You can Copy and Paste the commands below.

Open a command prompt window with administrative privileges and then run the following commands:

%windir%\Microsoft.NET\Framework\v4.0.30319\ngen uninstall “%ProgramFiles(x86)%\Microsoft Expression\Blend 4\Microsoft.Expression.Framework.dll”

%windir%\Microsoft.NET\Framework\v4.0.30319\ngen uninstall “%ProgramFiles(x86)%\Microsoft Expression\Blend 4\Microsoft.Expression.Blend.dll”

%windir%\Microsoft.NET\Framework\v4.0.30319\ngen uninstall “%ProgramFiles(x86)%\Microsoft Expression\Blend 4\Microsoft.Expression.Project.dll”

If you have installed Expression Blend 4 SP1, you must also uninstall the native image of the Microsoft.Expression.WindowsPhone.dll file from the cache by using the following command:

%windir%\Microsoft.NET\Framework\v4.0.30319\ngen uninstall “%ProgramFiles(x86)%\Microsoft Expression\Blend 4\Microsoft.Expression.WindowsPhone.dll”


What’s also rather interesting is that when installing VS11 Ultimate on to a Win 7 box you are not able to create Metro apps.

Big thanks to Steve White and Joanna Mason from the Expression Blend team for helping to resolve this issue.

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One Response to “Expression Blend 4 does not start after installing the NET Framework 4.5 Developer Preview”

  1. Thank’s for your tip… it help me a lot…


    Juan Rios

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