I have a Windows 7 - 64 bit machine.
I downloaded MSSQL 2008 R2 Management Studio Express file SQLManagementStudio_x64_ENU.exe from the link http://www.microsoft.com/en-us/download/details.aspx?id=22985&hash=RxCJQ7S%2bfpcN7bMDM06Y86qF85Uz6bnxos%2flkJxaVgHLYZf3%2fJwlYp2LwjKuoEa2v1VIA0NoLvZBInjv5Db4SQ%3d%3d
The download was fine. However when I tried to install it gave following error
Error
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************** Exception Text **************
System.Configuration.ConfigurationErrorsException: An error occurred creating the configuration section handler for userSettings/Microsoft.SqlServer.Configuration.LandingPage.Properties.Settings: Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find th ...
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