mysql service 不见了

参考以下命令：
    5.1及后续版本：
D:\MySQL\bin>mysqld.exe -install
Service successfully installed.

D:\MySQL\bin>net start mysql


5.0版本：
D:\MySQL\bin>mysqld-nt.exe -install
Service successfully installed.

D:\MySQL\bin>net start mysql

MySQL 服务已经启动成功。