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As you can see in Windows Control Panel 'System' applet there are two groups of environment variables: USER and SYSTEM. Here presents function for retrieve SYSTEM variable value.

   1:  # -*- coding: Windows-1251 -*-

   2:  '''

   3:  getenv_system.py

   4:   

   5:  Get SYSTEM environment value, as if running under Service or SYSTEM account

   6:   

   7:  Author: Denis Barmenkov <denis.barmenkov@gmail.com>

   8:   

   9:  Copyright: this code is free, but if you want to use it, 

  10:             please keep this multiline comment along with function source. 

  11:             Thank you.

  12:   

  13:  2006-01-28 15:30

  14:  '''

  15:   

  16:  import os, win32api, win32con

  17:   

  18:  def getenv_system(varname, default=''):

  19:      v = default

  20:      try:

  21:          rkey = win32api.RegOpenKey(win32con.HKEY_LOCAL_MACHINE, 'SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment')

  22:          try:

  23:              v = str(win32api.RegQueryValueEx(rkey, varname)[0])

  24:              v = win32api.ExpandEnvironmentStrings(v)

  25:          except:

  26:              pass

  27:      finally:

  28:          win32api.RegCloseKey(rkey)

  29:      return v

  30:   

  31:  print 'SYSTEM.TEMP => %s' % getenv_system('TEMP')

  32:  print 'USER.TEMP   => %s' % os.getenv('TEMP')