安裝MYSQL出錯：a windows service with the name MYSQL already...service.

今天把mysql5.1卸載了，想裝個5.5，安裝時提示：a windows service with the name MYSQL already exists.Please uninstall this service correctly or choose a different name for the new service.

可以嘗試刪除殘留的註冊表信息HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services下面找到MySQL註冊表信息把它整個刪掉後，重裝mysql成功了！

過了這步到啓動service時又提示：Cannot create windows service for mysql.error:0

WIN+R進入CMD命令行：

Microsoft Windows [版本 6.1.7600]
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C:\Users\Stone>sc delete mysql
[SC] DeleteService 成功

C:\Users\Stone>

之後就搞定了！