mysql数据库连接不上已解决悬赏5积分

windows2012系统下安装的禅道，昨天因为安装了另外一个开源软件，造成今天登陆不上。描述如下：

11:49:50 ERROR: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO) in D:\OA\ZenTao\zentao\framework\base\router.class.php on line 1883, last called by D:\OA\ZenTao\zentao\framework\base\router.class.php on line 1841 through function connectByPDO.
in D:\OA\ZenTao\zentao\framework\base\router.class.php on line 1932 when visiting

2：电脑服务里面mysql 状态：启动 ；启动类型：禁用：修改启动类型的时候告知“指定的服务已经标记为删除”