error when uploading jpg image

hi,
why did this code that upload image to database gives me warning when I'm trying to upload jpg or png files?
the warning is :
Warning: fopen(E:/tmp/) [function.fopen]: failed to open stream: Permission denied in c:\program files\apache group\webroot\image uploadphp.php on line 17
Warning: fread(): supplied argument is not a valid stream resource in c:\program files\apache group\webroot\image uploadphp.php on line 17
large.jpg
but it does not do this when I'm uploading gif file!!
my code is :
<?php
require($_SERVER["DOCUMENT_ROOT"]."\config\kdem_db_config.php");
    $link = @mysql_connect($db_host, $db_user, $db_password);

    if (!$link) {
       die('Could not connect: ' . mysql_error());
    }
    else echo "Connection made";
    mysql_select_db($db_name,$link);
         $form_data = $HTTP_POST_FILES["userfile"]["tmp_name"];
//move it to some temp dir
         $base_name = "E:/tmp/".basename($form_data);
         move_uploaded_file($form_data, $base_name);
// read the file
         $data = addslashes(fread(fopen($base_name, "r"), filesize($base_name)));
//insert query
$imageName = basename($_FILES['userfile']['name']);
echo "$imageName";
        $query="insert INTO img_pg
                  VALUES ('$imageName','$data','{$HTTP_POST_FILES[userfile][size]}','{$HTTP_POST_FILES[userfile][type]}')";
                  mysql_query($query, $link) or die (mysql_error());
?>
the img_pg table structure is :
+----------+--------------+------+-----+---------+-------+
| Field    | Type         | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| img_name | varchar(100) | YES  |     | NULL    |       |
| img_data | longblob     | YES  |     | NULL    |       |
| img_size | varchar(60)  | YES  |     | NULL    |       |
| img_type | varchar(60)  | YES  |     | NULL    |       |
+----------+--------------+------+-----+---------+-------+
notice that I'm using php5 with mysql5 with windows xp.