Unable to find vcvarsall.bat

I have mingw (g++ (GCC) 4.6.1) and python 2.7.3 in a windows 7 box and I'm trying to install PyCrypto.
It all started with this error when running setup.py install:

error: Unable to find vcvarsall.bat

Easily solved after googling the error by specifying mingw as the compiler of choice:

setup.py install build --compiler=mingw32`

The problem is that then I got a different error:

configure: error: cannot run C compiled programs.

It turns out that my anti-virus was blocking the execution of a freshly compiled .exe. I just disabled the anti-virus "resident shield" and went to the next error:

cc1.exe: error: unrecognized command line option '-mno-cygwin' 
error: command 'gcc' failed with exit status 1

This solved it: "Either install a slightly older version of MinGW,
or edit distutils\cygwinccompiler.py in your Python directory to remove all instances of -mno-cygwin