diff --git a/src/OGAgentUser.py b/src/OGAgentUser.py
index 4ec09ce..0a7c9ee 100644
--- a/src/OGAgentUser.py
+++ b/src/OGAgentUser.py
@@ -32,14 +32,13 @@
 from __future__ import unicode_literals
 
 import sys
-from PyQt4 import QtGui
-from PyQt4 import QtCore
-
 import time
 import signal
 import json
 import six
 import atexit
+from PyQt4 import QtGui
+from PyQt4 import QtCore
 
 from opengnsys import ipc
 from opengnsys import utils
@@ -53,6 +52,11 @@ from opengnsys import VERSION
 from opengnsys.config import readConfig
 from opengnsys.loader import loadModules
 
+# Set default characters encoding to UTF-8
+reload(sys)
+if hasattr(sys, 'setdefaultencoding'):
+    sys.setdefaultencoding('utf-8')
+
 trayIcon = None
 
 def sigAtExit():
@@ -309,7 +313,7 @@ class OGASystemTray(QtGui.QSystemTrayIcon):
             self.cleanup()
             self.app.quit()
 
-    def closeEvent(self,event):
+    def closeEvent(self, event):
         logger.debug("Exec closeEvent")
         event.accept()
         self.quit()
diff --git a/src/opengnsys/windows/operations.py b/src/opengnsys/windows/operations.py
index 4ff88c3..32ad817 100644
--- a/src/opengnsys/windows/operations.py
+++ b/src/opengnsys/windows/operations.py
@@ -237,5 +237,5 @@ def showPopup(title, message):
     '''
     Displays a message box on user's session (during 1 min).
     '''
-    return subprocess.call('mshta "javascript:var sh=new ActiveXObject(\'WScript.Shell\'); sh.Popup( \'{}\', 60, \'{}\', 64); close()"'.format(message, title), shell=True)
+    return subprocess.call('mshta "javascript:var sh=new ActiveXObject(\'WScript.Shell\'); sh.Popup( \'{}\', 60, \'{}\', 64); close()"'.format(message.encode('unicode_escape'), title.encode('unicode_escape')), shell=True)
 
diff --git a/src/setup.py b/src/setup.py
index c55b4aa..f80bf33 100644
--- a/src/setup.py
+++ b/src/setup.py
@@ -121,7 +121,7 @@ setup(
             'bundle_files': 3,
             'compressed': True,
             'optimize': 2,
-            'includes': ['sip', 'PyQt4', 'win32com.shell', 'requests'] + HIDDEN_BY_SIX,
+            'includes': ['sip', 'PyQt4', 'win32com.shell', 'requests', 'encodings', 'encodings.utf_8'] + HIDDEN_BY_SIX,
             'excludes': ['doctest', 'unittest'],
             'dll_excludes': ['msvcp90.dll'],
             'dist_dir': '..\\bin',