I installed several times the qt creator but it never cost me as much as in my current PC; First I used the installer that always had on my Pendrive (that of Qt 5.8), told m
You have to set a valid compiler to build your project. As any compiler is not set, it is asking you to check the configuration.
For example in my PC, I get the following as compiler output:
11:13:33: Running steps for project ListViewExample...
11:13:33: Configuration unchanged, skipping qmake step.
11:13:33: Starting: "C:\Qt\Qt5.2.1\Tools\mingw48_32\bin\mingw32-make.exe"
C:/Qt/Qt5.2.1/Tools/mingw48_32/bin/mingw32-make -f Makefile.Debug
Here you can observe that C:/Qt/Qt5.2.1/Tools/mingw48_32/bin/mingw32-make is the make compiler which builds the application.
You can set the compiler path here: Tools > Options > Build & Run > Kits. Select the kit displayed and select a valid compiler.
You can try this youtube video link. Hope this solves your problem.