Software: Apache. PHP/5.5.15 

uname -a: Windows NT SVR-DMZ 6.1 build 7600 (Windows Server 2008 R2 Enterprise Edition) i586 

SYSTEM 

Safe-mode: OFF (not secure)

E:\nuevo\htdocs\BLA\admin\carpetas\   drwxrwxrwx
Free 7.28 GB of 239.26 GB (3.04%)
Detected drives: [ a ] [ c ] [ d ] [ e ] [ f ]
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Viewing file:     captcha.php (477 B)      -rw-rw-rw-

<?php
session_start();
function randomText($length) {
    $pattern = "1234567890abcdefghijklmnopqrstuvwxyz";
    for($i=0;$i<$length;$i++) {
      $key .= $pattern{rand(0,35)};
    }
    return $key;
}

$_SESSION['tmptxt'] = randomText(8);
$captcha = imagecreatefromgif("bgcaptcha.gif");
$colText = imagecolorallocate($captcha, 0, 0, 0);
imagestring($captcha, 5, 16, 7, $_SESSION['tmptxt'], $colText);

header("Content-type: image/gif");
imagegif($captcha);
?>