It doesn't look like Vista shows the powershell prompt

modules/exploits/windows/browser/ms14_064_ole_code_execution.rb

@@ -56,7 +56,13 @@ class Metasploit4 < Msf::Exploit::Remote
             }
           ],
           [
-            'Windows 7 SP1',
+            'Windows Vista',
+              {
+                'os_name' => OperatingSystems::Match::WINDOWS_VISTA
+              }
+          ],
+          [
+            'Windows 7',
               {
                 'os_name' => OperatingSystems::Match::WINDOWS_7
               }