When I try to start a site in IIS it says:
the process can\'t access the file because it used by another process
I searched in Goog
You can also run this command to find out which application or service is using the port and then trace it down in Task manager (Provided it's not the Web Deploy Agent Service).
netstat -o -n -a | findstr 0.0:80
Then open Task manager, go to Processes, click the "Show processes for all users" checkbox and then click the View menu and Go to the Columns, add the PID column.
Match the Process ID from the netstat command to the PID in task manager and you will find the service or application that's using the port.