Mysql uses port 3306, you must check if another service is not using this port.
If you use xampp or wamp for example and the mysql service does not start, this means that a service is already using port 3306. By default, the mysql service on your machine is activated and you should deactivate it.
You can do like this:
Windows + r > search 'services.msc' >
then search mysql and disable it.