Just a warning to anyone else out there who uses Skype: Skype uses TCP Port 80 and Port 443 as alternatives for incoming calls! This will prevent you from starting up IIS or Apache (which was happening to me).
To fix this issue open up Skype Options (Tools > Options in the Menu) and select the “Connection” tab. There you will find a checkbox marked “Use port 80 and 443 as alternatives for incoming connections”. Uncheck that box and you should be okay.