Building tutorial gives error: ".... cannot execute .... c2.dll"

Having successfully installed Qt-5.1.0 on my Windows 7 (64 bit) machine, I went through the beginner’s tutorial: http://qt-project.org/doc/qt-5.0/qtdoc/gettingstartedqt.html When I try to build it, I get this error: :-1: error: D8027 : cannot execute ‘C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\BIN\amd64\c2.dll’ The c2.dll file does exist in that path, except that “BIN” is “bin” on my machine. Since Windows is supposed to be case insensitive, I doubt that that’s the problem. Any other ideas? Thanks for any help!