port 3306 is not working

This means an instance of your sql is already running.

To find out what program is running on all port run following command.

C:\>netstat -a

this will show list of all programs listening on different ports.
Find ProcessID(pid) of the program running on port 3306.
(if not showing Run cmd as Administrator)

now you need to kill this process.
to kill the process use following command...

C:\kill [pid of process];

Hope This Help You
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Pratik Bhuva