This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
I don't think you're getting this error while executing a C program; it looks more like you're getting the error while trying to build the program. The error message means what it says; "mingw32-gcc-4.7.2" is not found. mingw is a particular version of a specific compiler; either you don't have it installed or it's not on the path used to find it.