changed to xcopy for windows

core/install/resources/classes/install_switch.php

@@ -88,7 +88,7 @@ include "root.php";
 			elseif(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN'){
 				$src = normalize_path_to_os($src);
 				$dst = normalize_path_to_os($dst);
-				exec("copy /L /Y \"$src\" \"$dst\"");
+				exec("xcopy /E /Y \"$src\" \"$dst\"");
 			}
 			else {
 				$dir = opendir($src);