Auto image resize function not working on local install?

Hi I’m working on a locally installed (WAMP) website. I’m using this code in the functions file to limit the largest images to the dimensions set in Settings>Media:

add_filter('wp_generate_attachment_metadata','replace_uploaded_image');
	/* limits image size to large setting */
function replace_uploaded_image($image_data) {

    if (!isset($image_data['sizes']['large'])) return $image_data;

    // paths to the uploaded image and the large image
    $upload_dir = wp_upload_dir();
    $uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file'];
    $large_image_location = $upload_dir['path'] . '/'.$image_data['sizes']['large']['file'];

    // delete the uploaded image
    unlink($uploaded_image_location);

    // rename the large image
    rename($large_image_location,$uploaded_image_location);

    // update image metadata and return them
    $image_data['width'] = $image_data['sizes']['large']['width'];
    $image_data['height'] = $image_data['sizes']['large']['height'];
    unset($image_data['sizes']['large']);

    return $image_data;
}

This works great on several other of my sites. I don’t need the full-size image on most sites so this is awesome to save the time of resizing before uploading. However, I just put it on my locally installed site that I’m working on, and get the following error:

Warning: rename(C:\Users\Tevya\Work\wamp\www\acsr/wp-content/uploads/2010/08/American-Construction-Supply-119-800x492.jpg,C:\Users\Tevya\Work\wamp\www\acsr/wp-content/uploads/2009/11/American-Construction-Supply-119.jpg) [function.rename]: No error in C:\Users\Tevya\Work\wamp\www\acsr\wp-content\themes\centivio3\functions.php on line 17
414

When I try to upload a new image. It seems to actually work, however, it doesn’t properly rename the large file to the original file name, so if you use the link to file button, or try to insert the full-size image, there’s nothing there.

Can anyone tell me if this is typical of WAMP and I just need to get this site on the host and it will work then? Or if there’s something I can do to make it work locally? Or is it perhaps a conflict with the theme? Any help would be greatly appreciated.