Could you please open the sample extraction folder
and delete all the sample folders (except the Dependencies folder) and also delete the sample databases in the SQL Management Studio. Then please open the SDK sample in Visual Studio
and run it in browser to see if you will continue experiencing the same issue.
Please also make sure that you have the Microsoft .NET Framework 4.0 installed on your machine as the Sitefinity SDK samples reference the .NET 4.0 version.
The problem is caused because when running a sample from the SDK in browser it by default tries to open it with visual studio 2010. With the above we aim to remove the reference for VS 2010 so the correct version of visual studio will be used to open a sample.
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