title: Python virtualenv has changed sys.path permanently
body: <p>I have activated a python virtualenv (dev) for one of my projects. However, don't know what happened, it looks like it has changed the path permanently. I cannot access my global packages. When I print sys.path it shows me paths related to virtualenv (dev) which is no more activated. When I run pip list, it shows me packages installed for virtualenv (dev) and not the ones install globally (c:\python27\Lib\sitepackages). Any idea what must have gone wrong? And how do I reset sys.path? </p>
  
  <p>I checked out RegistryKey (HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.7\PythonPath) and Environment variables, everything looks okay. Any light on this issue would be helpful...</p>