BleepingComputer.com: Help Plz, Ports Open!

Hi i did shieldsup port scanner, pc flank port scanner and hackerwatch probe tests and they all showed my port 80 open and yulnerable to attack!
I have kaspersky internet security 2009 and it closes all ports by default but for me my port 80 is open. This is usually for web servers right? im not a server at all...
Im not behind a router and niether has my isp kept my port 80 open. Could it be possible that my computer is infected with some sorta malware??!
normal malware remover showed some keygens as trojans but i know theyre clean. Also, Kaspersky showed a firewall leak test from COMODO CPIL as trojan but it removed it.
after that ,I did a sdfraud fix scan , combofix scan ,malwarebytes anti malware scan, webcureit scan . they all showed CLEAN!
WHat should i do? should i post hijackthis log??
Thanks

The issue is not as critical as it sounds. Port 80 is the default port for http. If you host a website on your PC, or if there is a program which requires a hosted interface then it should be open. If you are nervous about it, you could peruse your firewall settings to tweak accessibility or simply block it altogether.

edit: If you can, see if you can get a router with Network Address Translation (most have this feature). This will help protect you.