Problems with re-deploying MySQL

Windows Server R2

mysql:5.7

1. Download Mysql.
2. Configuring the MySQL environment variable
3. Register the MySQL service. (mysqld install)
4. Remove registration,SC delete mysql ( when removing, you need to close the Windows Service window, otherwise you will be prompted to "The specified service is marked for deletion")
5. View MySQL 's services,services.msc
6. Remove MySQL service,mysqld-nt--remove
7. Problem, after installation, always prompt me that the system cannot find the specified file, http://jingyan.baidu.com/article/91f5db1bd298ed1c7f05e315.html

After modifying the registry, start the mysql service, and the following problems occur.

Mom eggs, engaged in an afternoon, incredibly is a MySQL version of the problem,5.7 version of the downgrade to 5.6.27 on ok , I go ~ ~ ~

Problems with re-deploying MySQL