Updated Windows install instructions.

docs/source/usersguide/install.rst

@@ -126,11 +126,33 @@ This will build an executable named ``openmc``.
 Compiling on Windows
 --------------------
 
-To compile OpenMC on a Windows operating system, you will need to first install
-Cygwin_, a Linux-like environment for Windows. When configuring Cygwin, make
-sure you install both the gfortran compiler as well as git. Once you have
-obtained the source code, run the following commands from within the source code
-root directory:
+Using Cygwin
+------------
+
+One option for compiling OpenMC on a Windows operating system is to use Cygwin_,
+a Linux-like environment for Windows. You will need to first `install
+Cygwin`_. When you are asked to select packages, make sure the following are
+selected:
+
+* Devel: gcc4-core
+* Devel: gcc4-fortran
+* Devel: make
+
+If you plan on obtaining the source code directly using git, select the
+following packages:
+
+* Devel: git
+* Devel: git-completion (Optional)
+* Devel: gitk (Optional)
+
+In order to use the Python scripts provided with OpenMC, you will also need to
+install Python. This can be done within Cygwin or directly in Windows. To
+install within Cygwin, select the following packages:
+
+* Python: python (Version > 2.7 recommended)
+
+Once you have obtained the source code, run the following commands from within
+the source code root directory:
 
 .. code-block:: sh
 
@@ -139,7 +161,34 @@ root directory:
 
 This will build an executable named ``openmc``.
 
-.. _Cygwin: http://www.cygwin.com/
+.. _Cygwin: http://cygwin.com/
+.. _install Cygwin: http://cygwin.com/setup.exe
+
+Using MinGW
+-----------
+
+An alternate option for installing OpenMC on Windows is using MinGW_, which
+stands for Minimalist GNU for Windows. An executable for installing the MinGW
+distribution is available on SourceForge_. When installing MinGW, make sure the
+following components are selected:
+
+* MinGW Compiler Suite: Fortran Compiler
+* MSYS Basic System
+
+Once MinGW is installed, copy the OpenMC source distribution to your MinGW home
+directory (usually C:\\MinGW\\msys\\1.0\\home\\YourUsername). Once you have
+the source code in place, run the following commands from within the MinGW shell
+in the root directory of the OpenMC distribution:
+
+.. code-block:: sh
+
+    cd src
+    make
+
+This will build an executable named ``openmc``.
+
+.. _MinGW: http://www.mingw.org
+.. _SourceForge: http://sourceforge.net/projects/mingw
 
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