diff --git a/build/exe/doliwamp/install.forced.php.install b/build/exe/doliwamp/install.forced.php.install
index f4e4df1e89c..2cbe29455c5 100644
--- a/build/exe/doliwamp/install.forced.php.install
+++ b/build/exe/doliwamp/install.forced.php.install
@@ -9,4 +9,5 @@ $force_install_databasepass='WAMPMYSQLNEWPASSWORD';
 $force_install_databaserootlogin='root';
 $force_install_databaserootpass='WAMPMYSQLNEWPASSWORD';
 $force_install_dolibarrlogin='admin';
+$force_install_renamedir='1';
 ?>
\ No newline at end of file
diff --git a/htdocs/install/etape5.php b/htdocs/install/etape5.php
index eca449c8b4a..72660fee652 100644
--- a/htdocs/install/etape5.php
+++ b/htdocs/install/etape5.php
@@ -35,6 +35,19 @@ $langs->load("install");
 
 $success=0;
 
+// Init "forced values" to nothing. "forced values" are used after an doliwamp install wizard.
+if (! isset($force_install_type))              $force_install_type='';
+if (! isset($force_install_port))              $force_install_port='';
+if (! isset($force_install_database))          $force_install_database='';
+if (! isset($force_install_createdatabase))    $force_install_createdatabase='';
+if (! isset($force_install_databaselogin))     $force_install_databaselogin='';
+if (! isset($force_install_databasepass))      $force_install_databasepass='';
+if (! isset($force_install_databaserootlogin)) $force_install_databaserootlogin='';
+if (! isset($force_install_databaserootpass))  $force_install_databaserootpass='';
+if (! isset($force_install_renamedir))         $force_install_renamedir='';
+if (file_exists("./install.forced.php")) include_once("./install.forced.php");
+
+
 
 dolibarr_install_syslog("etape5: Entering etape5.php page", LOG_INFO);
 
@@ -176,7 +189,17 @@ if ($_POST["action"] == "set")
 {
     // Fin install
     print $langs->trans("SystemIsInstalled")."<br>";
-    print '<div class="warning">'.$langs->trans("WarningRemoveInstallDir")."</div>";
+    if (empty($force_install_renamedir))
+	{
+		print '<div class="warning">'.$langs->trans("WarningRemoveInstallDir")."</div>";
+	}
+	else
+	{
+		// Open the file and erase the contents if any
+		$fp = fopen("../../install.lock", "w");
+		fwrite($fp, "This is a lock file to prevent use of install pages");
+		fclose($fp);
+	}
     
     print "<br>";
     
@@ -188,7 +211,17 @@ if ($_POST["action"] == "upgrade")
 {
     // Fin install
     print $langs->trans("SystemIsUpgraded")."<br>";
-    print '<div class="warning">'.$langs->trans("WarningRemoveInstallDir")."</div>";
+    if (empty($force_install_renamedir))
+	{
+		print '<div class="warning">'.$langs->trans("WarningRemoveInstallDir")."</div>";
+	}
+	else
+	{
+		// Open the file and erase the contents if any
+		$fp = fopen("../../install.lock", "w");
+		fwrite($fp, "This is a lock file to prevent use of install pages");
+		fclose($fp);
+	}
     
     print "<br>";
 }
diff --git a/htdocs/install/inc.php b/htdocs/install/inc.php
index 51f5a9fa42c..c2dde69e0e3 100644
--- a/htdocs/install/inc.php
+++ b/htdocs/install/inc.php
@@ -30,13 +30,6 @@ require_once('../lib/admin.lib.php');
 
 // DOL_DOCUMENT_ROOT has been defined in function.inc.php to '..'
 
-// Security check
-if (eregi('install.norun',$_SERVER["SCRIPT_FILENAME"])) 
-{
-	dolibarr_print_error('','Install pages have been disabled for security reason.');
-	exit;
-}
-
 // Correction PHP_SELF (ex pour apache via caudium) car PHP_SELF doit valoir URL relative
 // et non path absolu.
 if (isset($_SERVER["DOCUMENT_URI"]) && $_SERVER["DOCUMENT_URI"])
@@ -114,7 +107,24 @@ define('DOL_DATA_ROOT',(isset($dolibarr_main_data_root)?$dolibarr_main_data_root
 if (! isset($conf->character_set_client))     $conf->character_set_client='iso-8859-1';
 if (! isset($conf->db->dolibarr_main_db_collation)) $conf->db->dolibarr_main_db_collation='latin1_swedish_ci';
 if (! isset($conf->db->user)) $conf->db->user='';
+
 	
+// Security check
+if (eregi('install.norun',$_SERVER["SCRIPT_FILENAME"])) 
+{
+	print 'Install pages have been disabled for security reason (directory renamed with .norun).';
+	exit;
+}
+if (file_exists('../../install.lock'))
+{
+	print 'Install pages have been disabled for security reason (by lock file install.lock).<br>';
+	print '<a href="'.$dolibarr_main_url_root .'/admin/index.php?mainmenu=home&leftmenu=setup'.(isset($_POST["login"])?'&username='.urlencode($_POST["login"]):'').'">';
+	print 'Click here to go to Dolibarr';
+	print '</a>';
+	exit;
+}
+
+
 // Forcage constante LOG