Recently we upgraded one of our build servers to x64 and encountered the following error.
Microsoft.Silverlight.Common.targets (101): The Silverlight 3 SDK is not installed.
The obvious first thought is we didn't install the SDK, but in fact it was installed. Doing some searching I found this forum thread talking about the problem which ultimately lead me to Andru's blog post with a good solution. His solution is to simply use the Build Parameters feature of VS2010 to be able to define the platform as x86 to run the build. You can find this option by right clicking "Edit Build Definition" and going to the Process section in the left navigation
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