Your Qt installation is for MinGW. You cannot use it with Visual Studio just like that. You have to download the source package of Qt and compile it yourself for Visual Studio.
- download qt-win-opensource-src-4.4.0.zip
- unarchive the package
- run configure script
- compile it according to instructions on the screen
See also Installing Qt/Windows and [WIKI]Qt4 with Visual Studio[/WIKI].
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