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isn
I also have this error in my system (Windows 8 x64) when installing QT. I tried installers like QT 5.1.1 VS2012 x64, QT 5.1.1 VS2012 x64 OpenGL, and Online Windows Installer with all components (include VS2012 and MinGW) installed.
If I paste "qmake.exe -query" to command line it outputs a list of directories. Installation might be completed after several clicks on "Ignore" button, but installed QT cannot detect qmake.exe. Also it writes "qmake does not exist or is not executable" when trying to add qmake manually in Preferences dialog window.
P.S. I think this information might be useful: I have the similar problem when I run PHP scripts using Cygwin terminal. Cygwin does not return any output, but Windows command line works fine. It might be a problem with transmitting output between applications. As I understand, QT installer also tries to parse some output from "qmake.exe -query" command, but it returns nothing.