diff --git a/invesalius/reader/dicom_reader.py b/invesalius/reader/dicom_reader.py
index 82f9ba3..6e0a793 100644
--- a/invesalius/reader/dicom_reader.py
+++ b/invesalius/reader/dicom_reader.py
@@ -188,7 +188,7 @@ class LoadDicom:
                 level = [float(value) for value in data.split('\\')][0]
                 data = data_dict[str(0x028)][str(0x1051)]
                 window =  [float(value) for value in data.split('\\')][0]
-            except(KeyError):
+            except(KeyError, ValueError):
                 level = 300.0
                 window = 2000.0 
      
diff --git a/invesalius/session.py b/invesalius/session.py
index 974785a..3da100c 100644
--- a/invesalius/session.py
+++ b/invesalius/session.py
@@ -17,7 +17,11 @@
 #    detalhes.
 #--------------------------------------------------------------------------
 
-import ConfigParser
+try:
+    import configparser as ConfigParser
+except(ImportError):
+    import ConfigParser
+
 import os
 import shutil
 import sys
--
libgit2 0.21.2