I just downloaded and installed the latest versions of the Qt SDK, Qt Creator, and the Qt add-in for Visual Studio (I\'m running VS 2010).
First, I tried creating a Qt pr
I'm almost positive that you have to rebuild the Qt libraries in Visual Studio first before you can use them. That probably explains why you're getting the error message that a Qt build can't be found, and that the version of Qt you're using was built with MinGW.
I suggest reading this blog post for what looks to be a solid how-to guide on integrating Qt with VS.
This looks like an even simpler guide, although it's in PDF format: Qt Installation for Visual Studio