"C:/Qt/2010.04/mingw/bin/mingw32-make.exe" exited with code %2.-->Error on windows

[Zlatomir]

MingW on windows doesn't have any issues (if you use Qt SDK or correctly configure the environment)

If your code worked on linux and doesn't work on windows, most likely, you imported the build configuration (and MingW tries to use the linux make files and other generated files), to solve this (if this is the case) you can use the Clean All option from the Build menu in Qt Creator, or manually delete the generated files.