I recently had to reinstall the OS in my dev block, and now I'm moving on to reinstalling various applications. I previously installed the WP7 SDK without any problems, but unfortunately this time I have problems. The only type of project that I have in the Silverlight category for Windows Phone is the one I downloaded from the online template section.

When I try to open it or any of the WP7 projects that I created earlier, I get "The project type is not supported by this installation." error. I'm not sure what I am missing. I followed the three steps listed here , so I installed the SDK, Dev tools, and Dev Tools. Installing VS2010 by itself seems fine, as I can build ASP.NET and Silverlight applications and run them without problems.
Has anyone come across something like this before?
Edit: I installed Service Pack 1 for VS 2010, but this has not helped yet.
Edit: I also reinstalled the Windows Phone Dev development tools, and this installation did not report errors, but I still do not get projects in the Silverlight category for Windows Phone.
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