If you’re running easy_install, pip, zc.buildout, virtualenv, or a similar tool on Windows, and it says: unable to find vcvarsall.bat The issue is that you need a compiler installed on your system. Many people seem to recommend MinGW, but I’ve been there, and it’s a huge pain in the butt. Just download and install Microsoft Visual Studio Express 2008 which is free. Please note the 2008 part. Thi