Many have already begun to try to use the latest release of VS2010 and received messages that the Silverlight 3 SDK could not be installed. This is a known problem and is easy to work around.
The problem lies in the fact that you have installed Silverlight 3 RTW, SDK version 3.0.40624.0. VS2010 tries to install Silverlight 3 GDR2 3.0.40818.0, which is not automatically updated. Just GDR and can not be installed and gives an error.
This case does not particularly affect the development of Silverlight applications, many have already confirmed this. However, some problems may arise as a result of using the Silverlight 3 RTW SDK. To fix the problem, you need to uninstall the Silverlight 3 SDK and install the
latest version .
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The VS2010 team is already working on a solution to this problem in the RTM version.