Please help as most of the internet stuff is like a foreign language to me. Since changing to a new ISP I notice Port 80 is open. This has never been open in the 5 plus years I have been using ZA. Please explain in simple terms how to close this as since port 80 has been open I have got various spyware etc so I am assuming this is the reason.

Operating System:Windows XP Home Edition
Software Version:8.0
Product Name:ZoneAlarm Pro