How to Check What's Using Port 80 or 443

I am using Xampp. And Apache runs on port 80. When I install Skype or some other HTTP services, then it also runs on the same port. Hence, Apache can't run on this machine. So, I need to check which port is running on that port. To check this, need to do the followings:

• 1) Go to START-->Run and type cmd to bring up a Command prompt.
• 2) In the Command Prompt window. type netstat -aon.
• 3) Open up the Windows Task Manager
• 4) Then stop the process ID that was running on port 80.

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