Пытаюсь удалить файл с помощью unlink:

$q= "SELECT name, medium, thumbnail FROM photos WHERE user='".$login."' AND num = ".$file;
	$sql = mysql_query($q);
	
	$arr = mysql_fetch_array($sql);
    
	$current_dir="D:/usr/mosts/site/www1";
	
	
	$normal= "'".$current_dir.$arr['name']."'";
	$medium = "'".$current_dir.$arr['medium']."'";
	$thumbnail= "'".$current_dir.$arr['thumbnail']."'";
	
	$test= "'".$current_dir."/test.txt'";
	
	echo $normal;
	
	
	
	unlink($test);
	
	unlink($normal);
	unlink($medium);
	unlink($thumbnail);

В итоге вылезает ошибка Invalid argument


'D:/usr/mosts/site/www1/photos/full/201404132104ggrtgrt.jpg'

Warning: unlink('D:/usr/mosts/site/www1/test.txt'): Invalid argument in D:\usr\mosts\site\www1\image_delete.php on line 49

Warning: unlink('D:/usr/mosts/site/www1/photos/full/201404132104ggrtgrt.jpg'): Invalid argument in D:\usr\mosts\site\www1\image_delete.php on line 51

Warning: unlink('D:/usr/mosts/site/www1/photos/medium/normal_201404132104ggrtgrt.jpg'): Invalid argument in D:\usr\mosts\site\www1\image_delete.php on line 52

Warning: unlink('D:/usr/mosts/site/www1/photos/thumbnails/small_201404132104ggrtgrt.jpg'): Invalid argument in D:\usr\mosts\site\www1\image_delete.php on line 53