Installation Error

C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\dedupe>python setup.py install
running install
running bdist_egg
running egg_info
writing requirements to Dedupe.egg-info\requires.txt
writing Dedupe.egg-info\PKG-INFO
writing top-level names to Dedupe.egg-info\top_level.txt
writing dependency_links to Dedupe.egg-info\dependency_links.txt
reading manifest file 'Dedupe.egg-info\SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'Dedupe.egg-info\SOURCES.txt'
installing library code to build\bdist.win-amd64\egg
running install_lib
running build_py
running build_ext
building 'dedupe.distance.affinegap' extension
error: Unable to find vcvarsall.bat