Mysql 安装失败的解决办法-以下是错误的类型-The security settings could not be applied to the database because the connection has failed with the following error.Error Nr.1045Access denied for user rootlocalhost(using password:YES)If a personal firewall is running on your machine,please make sure you have opened the TCP port 3306 for connections.Otherwise no client application can connect to the server.After you have opened the port please press Retry to apply the security settings.If you are re-installing after uou just uninstalled the MySQL server please note that the data directory was not removed automatically.Therefore the old password from your last installation is still needed to connect to the server.In this case please select skip now and re-run the Configuration Wizard from the start menu.解决：开始第一行的密码不要写，应该是空的！然后输入新密码1, 卸载 MySQL2, 删除目录 C:Documents and SettingsAll UsersApplication DataMySQL3, 重新安装 MySQL,如果不行，重启安装 就 OK 啦=其他 Mysql安装错误 解决方法 参考关键字: mysql*The security settings could not be applied to the database because the connection has failed with the following error.Error Nr. 2003Cant connect to MySQL server on localhost (10061)If a personal firewall is running on your machine, please make sure you have opened the TCP port 3306 for connections. Otherwise no client application can connect to the server. After you have opened the port please press Retry to apply the security settings.If you are re-installing after you just uninstalled the MySQL server please note that the data directory was not removed automatically. Therefore the old password from your last installation is still needed to connect to the server. In this case please select skip now and re-run the Configuration Wizard from the start menu.*The security settings could not be applied to the database because the connection has failed with the following error.Error Nr. 1045Access denied for user rootlocalhost (using password: YES)If a personal firewall is running on your machine, please make sure you have opened the TCP port 3306 for connections. Otherwise no client application can connect to the server. After you have opened the port please press Retry to apply the security settings.If you are re-installing after you just uninstalled the MySQL server please note that the data directory was not removed automatically. Therefore the old password from your last installation is still needed to connect to the server. In this case please select skip now and re-run the Configuration Wizard from the start menu.MySQL 5.1 安装过程中报 apply security setting错误的解决办法1, 卸载 MySQL2, 删除目录 C:Documents and SettingsAll UsersApplication DataMySQL3, 重新安装 MySQL 就 OK 啦-MySQL Could not start the service MySQL 解决方法安装 mysql 5.1.33,在运行 Server Instance Configuration wizard时的 Execute configurattion步骤中的第三项 Start Service进出错,错误提示为 Could not start the service MySQL (出现这种情况一般是因为装过 mysql，卸载不干净造成的。卸载后重启后再重装。注意看下服务，如果未能卸载，可以用 mysqld-nt -remove卸载)。具体方法如下:查看服务中有没有 mysql,如果有将该服务停掉;在控制面板中运行添加删除程序，将 mysql卸载;卸载后打开注册表，查看 HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices 下的键值，如果有相关 mysql键值(mysql、mysqladmin)则删掉，即可;重启，将 mysql的安装残余目录删掉 (查看服务，此时服务中已没有 mysql);重新安装 mysql.安装后先不要运行 Server Instance Configuration wizard，重启后在开始菜单中运行该向导，即可。PS:一种值得参考的方法-msyql安装到最后一步 start service错误解决方法1,到控制面板里面先把 mysql删除.2.到 c盘 C:Program Files目录下把 mysql目录删除.3.如果在其他盘还有设置目录也要删除.空目录也要删除4.到 regedit把注册表HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Eventlog/Applications/MySQLHKEY_LOCAL_MACHINE/SYSTEM/ControlSet002/Services/Eventlog/Applications/MySQLHKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Eventlog/Applications/MySQL有的话,全部删除！（技巧：用 F3循环查找“mysql”）5.如果任务管理器里有关 mysql内容也删除6,把防火墙关了7,重新装 mysql（这里我没有重启计算机）重装时候有必要的话,重启计算机,停用 IIS,和删除 temp里的临时文件.实在不行的话,配置 mysql时候,把 mysql服务换个服务名.*-删除项时出错。-无法删除 LEGACY_MYSQL51: 删除项时出错。-确定-解决办法:注册表项里右键增加 administrators所有权限 MYSQL