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Could not load type System.ServiceModel.Activation.HttpModule’ from assembly ‘System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=

If you already have .Net 4.0 installed and install a program that brings in an earlier version of .Net, or manually install an earlier version of .Net afterwards, you may get an exception page that matches the title of this article.

This is a simple fix, outlined in detail in MSDN article referenced at the bottom.

Navigate to:

%windir%\Microsoft.NET\Framework\v4.0.30319

%windir%\Microsoft.NET\Framework64\v4.0.30319 (on a 64-bit computer)

Run:

aspnet_regiis.exe /iru

That’s it!

http://support.microsoft.com/kb/2015129

IIS6 Change Framework Version without restart of W3SVC service

browse to the location of the folder containing the version of asp_net regiis such as:
C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319

run aspnet_regiis -lk to get the virtual path you will need in the next command. to see which ID matches your website launch IIS manager and under websites you will see a column called “identifier”.

run the command:
aspnet_regiis.exe -norestart -s “W3SVC\1398789133”

done.