In the Ide I choose an example , after that I choose target -- Qt 4.7.3 for Desktop - MinGW 4.4 (Qt SDK) Debug
Push the green RUN button , I got the error
C:\QtSDK\Examples\4.7\graphicsview\elasticnodes-build-desktop\debug\elasticnodes.exe exited with code -1073741792
then I change the target to Qt 4.7.3 for Desktop - MSVC2008 (Qt SDK) Debug
App runs.
Yes as I thought, you where trying to run VS built exe against MinGW built Qt.
It looks you have both version installed.

To be clear I dont understand your answer exactly.
MinGW is a compiler.
When install VS, the MS compiler gets install too (cl.exe).

Both compilers produce binaries which are not compatible (or at least not out of the box).
So you need to pay attention, when you build a project, with which compiler and Qt SDK you do it.
If you are not using MS tools for building, then install only the MinGW Qt SDK and binaries, this will eliminate any such confusion in the future.