CI framework gives error in xampp1.7.3

[eluser]suba[/eluser]
Hi all,

I installed xampp1.7.0 into my server.
I installed CI into my server.
am developing one project using CI.
going well.

But in my notebook , I installed xampp1.7.3 latest version.
I installed CI framework.
I have downloaded my project from server & put into my notebook.

Now I am trying to execute my project.
But they gives error message.

Error message is

Code:

Fatal Error: Class Model_sims not found in C:\xampp\htdocs\system\libraries\Loader.php
on line 184

But I have model_sims file in appropriate location.
my model_sims file is inside in system/applications/model/ directory.

I have setup auto load page also.
autoload page has

Code:

$autoload[‘model’] = array(‘model_sims’,‘model_students’,‘model_templates’);

this is my index page.

Code:

$system_folder = "system";
$application_folder = "application";

This is my config page

Code:

$config['base_url']    = "http://localhost/sims";
$config['index_page'] = "";

This is my .htaccess page

Code:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(401.shtml)
RewriteRule ^(.*)$ index.php?/$1 [L]

please advise me what is the problem?