diff --git a/cps/config_sql.py b/cps/config_sql.py
index c5287d36..b11d84fd 100644
--- a/cps/config_sql.py
+++ b/cps/config_sql.py
@@ -362,8 +362,10 @@ def _migrate_table(session, orm_class):
 
 def autodetect_calibre_binary():
     if sys.platform == "win32":
-        calibre_path = ["C:\\program files\calibre\calibre-convert.exe",
-                        "C:\\program files(x86)\calibre\calibre-convert.exe"]
+        calibre_path = ["C:\\program files\calibre\ebook-convert.exe",
+                        "C:\\program files(x86)\calibre\ebook-convert.exe",
+                        "C:\\program files(x86)\calibre2\ebook-convert.exe",
+                        "C:\\program files\calibre2\ebook-convert.exe"]
     else:
         calibre_path = ["/opt/calibre/ebook-convert"]
     for element in calibre_path:
diff --git a/cps/helper.py b/cps/helper.py
index b59d9bed..a4715033 100644
--- a/cps/helper.py
+++ b/cps/helper.py
@@ -634,11 +634,12 @@ def check_unrar(unrarLocation):
             unrarLocation = unrarLocation.encode(sys.getfilesystemencoding())
         unrarLocation = [unrarLocation]
         for lines in process_wait(unrarLocation):
-            value = re.search('UNRAR (.*) freeware', lines)
+            value = re.search('UNRAR (.*) freeware', lines, re.IGNORECASE)
             if value:
                 version = value.group(1)
                 log.debug("unrar version %s", version)
-    except OSError as err:
+                break
+    except (OSError, UnicodeDecodeError) as err:
         log.exception(err)
         return _('Error excecuting UnRar')
 
diff --git a/cps/subproc_wrapper.py b/cps/subproc_wrapper.py
index 0ad1c1d2..23facbd7 100644
--- a/cps/subproc_wrapper.py
+++ b/cps/subproc_wrapper.py
@@ -22,7 +22,7 @@ import os
 import subprocess
 
 
-def process_open(command, quotes=(), env=None, sout=subprocess.PIPE, serr=subprocess.PIPE):
+def process_open(command, quotes=(), env=None, sout=subprocess.PIPE, serr=subprocess.PIPE, newlines=True):
     # Linux py2.7 encode as list without quotes no empty element for parameters
     # linux py3.x no encode and as list without quotes no empty element for parameters
     # windows py2.7 encode as string with quotes empty element for parameters is okay
@@ -41,12 +41,13 @@ def process_open(command, quotes=(), env=None, sout=subprocess.PIPE, serr=subpro
         else:
             exc_command = [x for x in command]
 
-    return subprocess.Popen(exc_command, shell=False, stdout=sout, stderr=serr, universal_newlines=True, env=env)
+    return subprocess.Popen(exc_command, shell=False, stdout=sout, stderr=serr, universal_newlines=newlines, env=env)
 
 
 def process_wait(command, serr=subprocess.PIPE):
     # Run command, wait for process to terminate, and return an iterator over lines of its output.
-    p = process_open(command, serr=serr)
+    newlines = os.name != 'nt'
+    p = process_open(command, serr=serr, newlines=newlines)
     p.wait()
     for line in p.stdout.readlines():
         if isinstance(line, bytes):