diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index 6146235..5777a53 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -220,7 +220,7 @@ def _get_default_tempdir():
             except PermissionError:
                 # This exception is thrown when a directory with the chosen name
                 # already exists on windows.
-                if (_os.name == 'nt' and _os.path.isdir(dir) and
+                if (_os.name == 'nt' and _os.path.isdir(filename) and
                     _os.access(dir, _os.W_OK)):
                     continue
                 break   # no point trying more names in this directory
@@ -263,7 +263,7 @@ def _mkstemp_inner(dir, pre, suf, flags, output_type):
         except PermissionError:
             # This exception is thrown when a directory with the chosen name
             # already exists on windows.
-            if (_os.name == 'nt' and _os.path.isdir(dir) and
+            if (_os.name == 'nt' and _os.path.isdir(file) and
                 _os.access(dir, _os.W_OK)):
                 continue
             else:
@@ -368,14 +368,6 @@ def mkdtemp(suffix=None, prefix=None, dir=None):
             _os.mkdir(file, 0o700)
         except FileExistsError:
             continue    # try again
-        except PermissionError:
-            # This exception is thrown when a directory with the chosen name
-            # already exists on windows.
-            if (_os.name == 'nt' and _os.path.isdir(dir) and
-                _os.access(dir, _os.W_OK)):
-                continue
-            else:
-                raise
         return file
 
     raise FileExistsError(_errno.EEXIST,