diff --git a/install/install.inc.php b/install/install.inc.php
index a4f5df97b..22bb69a07 100644
--- a/install/install.inc.php
+++ b/install/install.inc.php
@@ -67,13 +67,15 @@ if (!is_dir($data_path))
 
 <?
 // data 디렉토리에 파일 생성 가능한지 검사.
-if (!(is_readable($data_path) && is_writeable($data_path) && is_executable($data_path)))
-{
-?>
-    <p><?=G4_DATA_DIR?> 디렉토리의 퍼미션을 707로 변경하여 주십시오.<br /><br />
-    $> chmod 707 <?=G4_DATA_DIR?> 또는 chmod uo+rwx <?=G4_DATA_DIR?><br /><br />
-    위 명령 실행후 브라우저를 새로고침 하십시오.</p>
-<?
-    exit;
+if (strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
+    if (!(is_readable($data_path) && is_writeable($data_path) && is_executable($data_path)))
+    {
+    ?>
+        <p><?=G4_DATA_DIR?> 디렉토리의 퍼미션을 707로 변경하여 주십시오.<br /><br />
+        $> chmod 707 <?=G4_DATA_DIR?> 또는 chmod uo+rwx <?=G4_DATA_DIR?><br /><br />
+        위 명령 실행후 브라우저를 새로고침 하십시오.</p>
+    <?
+        exit;
+    }
 }
 ?>
\ No newline at end of file
diff --git a/install/install_config.php b/install/install_config.php
index 9df437041..c0519a8ce 100644
--- a/install/install_config.php
+++ b/install/install_config.php
@@ -1,8 +1,4 @@
 <?
-$title = "그누보드4s 설치 3단계 중 2단계 설정";
-include_once ('../config.php');
-include_once ('./install.inc.php');
-
 $gmnow = gmdate('D, d M Y H:i:s').' GMT';
 header('Expires: 0'); // rfc2616 - Section 14.21
 header('Last-Modified: ' . $gmnow);
@@ -10,6 +6,10 @@ header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
 header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 header('Pragma: no-cache'); // HTTP/1.0
 
+$title = "그누보드4s 설치 3단계 중 2단계 설정";
+include_once ('../config.php');
+include_once ('./install.inc.php');
+
 if ($_POST['agree'] != '동의함') {
     echo "<div>라이센스(License) 내용에 동의하셔야 설치를 계속하실 수 있습니다.</div>".PHP_EOL;
     echo "<div><a href=\"./\">뒤로가기</a></div>".PHP_EOL;
diff --git a/install/install_db.php b/install/install_db.php
index ae491ed03..93a7443a6 100644
--- a/install/install_db.php
+++ b/install/install_db.php
@@ -1,9 +1,5 @@
 <?
 set_time_limit(0);
-
-include_once ('../config.php');
-include_once ('./install.inc.php');
-
 $gmnow = gmdate('D, d M Y H:i:s') . ' GMT';
 header('Expires: 0'); // rfc2616 - Section 14.21
 header('Last-Modified: ' . $gmnow);
@@ -11,6 +7,9 @@ header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
 header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 header('Pragma: no-cache'); // HTTP/1.0
 
+include_once ('../config.php');
+include_once ('./install.inc.php');
+
 //print_r($_POST); exit;
 
 $mysql_host  = $_POST['mysql_host'];
diff --git a/lib/common.lib.php b/lib/common.lib.php
index 4c0d5ff07..f45ef28a4 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -1795,13 +1795,16 @@ function get_skin_stylesheet($skin_path)
     if(!$skin_path)
         return "";
 
+    $doc_root = realpath($_SERVER['DOCUMENT_ROOT']);
+    $skin_path = realpath($skin_path);
+
     $str = "";
 
     $p = parse_url(G4_URL);
     $skin_url = $p['scheme'].'://'.$p['host'];
     if(isset($p['port']))
         $skin_url .= ':'.$p['port'];
-    $skin_url .= str_replace($_SERVER['DOCUMENT_ROOT'], "", $skin_path);
+    $skin_url .= str_replace("\\", "/", str_replace($doc_root, "", $skin_path));
 
     if(is_dir($skin_path)) {
         if($dh = opendir($skin_path)) {