Unable to open SDK projects

I am unable to open BizTalk SDK Projects and when I try top open I got 
One or more projects in the solution were not loaded correctly. Please see the output window for details.
C:\Program Files (x86)\Microsoft BizTalk Server 2010\SDK\Samples\Orchestrations\HelloWorld\HelloWorld.btproj : error : The project file 'C:\Program Files (x86)\Microsoft BizTalk Server 2010\SDK\Samples\Orchestrations\HelloWorld\HelloWorld.btproj' cannot be opened.
The project type is not supported by this installation.
I have Windows 7 64 Professional with VS2010, BizTalk Server 2010 Developer Edition, .Net 4.5 and MVC3
Any help would be appreciated.
...