安裝MYSQL最後一步“Apply security setting”出現如下錯誤：
The security settings could not be applied to the database because the connection has failed with the following error.
Error Nr. 1045
Access denied for user 'root'@'localhost' (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.
解決辦法：
1：卸載MYSQL。
2：刪除MYSQL安裝目錄（我的是C:\Program Files），刪除整個MYSQL文件夾。
3：重新安裝MYSQL。
注意：（本人也沒有調查到具體原因）
如果之前安裝過MYSQL，並創建過數據庫，可忽略此錯誤，實際上MYSQL安裝是成功的，打開NAVICAT（我用的是NAVICAT管理的MYSQL數據庫），可看到之前創建的鏈接和數據庫還在。