安裝drupal-6.0-beta4出現問題

我是新手，安裝drupal-6.0-beta4之前，已下載安裝xampp-win32-1.6.4
(套裝全包-Apach、MySQL、PHP、phpMyAdmin)且均已啟動。
我按先前爬文的步驟：(某一位前輩的文章之指示)
(1)下載後執行xampplite\xampp-control.exe 按apache及mysql後的start 啟動apache及mysql。
(2)在瀏覽器網址列打127.0.0.1/phpmyadmin/ 進入phpmyadmin變更密碼
變更完後 修改xampplite\phpmyadmin\config.inc.php
$cfg['Servers'][$i]['auth_type']改為http
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = '剛剛改的密碼';
(3)用上面的帳號密碼進入進入phpmyadmin後新增一個資料庫
將drupal解壓到xampplite\htdocs下
(4)編輯xampplite\htdocs\drupal\sites\default\settings.php
$db_url = 'mysql://root:mysql密碼@localhost/新增的drupal資料庫名稱';
(5)執行127.0.0.1/drupal/install.php
~~~~~~~~~~~~~~
結果出現以下訊息(如附檔)：「Requirements problem
The following error must be resolved before you can continue the installation process:
The directory files does not exist. To proceed with the installation, please ensure that the files directory exists and is writable by the installer. If you are unsure how to create this directory and modify its permissions, please consult the on-line handbook or INSTALL.txt.
Please check the error messages and try again.
」
我到底是那裡錯了~~~
請問各位先進是否救救我，安裝方法、步驟~~感激不盡。