I have MinGW on my windows 7 machine. I wish to install and use complete gcc for C compiler. I found there is no single pre-compiled ready-made installation file for this pu
I use msysgit to install gcc on Windows, it has a nice installer which installs most everything that you might need. Most devs will need more than just the compiler, e.g. the shell, shell tools, make, git, svn, etc. msysgit comes with all of that. https://msysgit.github.io/
edit: I am now using msys2. Msys2 uses pacman from Arch Linux to install packages, and includes three environments, for building msys2 apps, 32-bit native apps, and 64-bit native apps. (You probably want to build 32-bit native apps.)
https://msys2.github.io/
You could also go full-monty and install code::blocks or some other gui editor that comes with a compiler. I prefer to use vim and make.