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First quick check is to telnet to port 80 and send it a http command like


HEAD / HTTP/1.0


(hit two returns after that). If it's an http server it should include a line identifying it. If it's not an http server it might reply with a recognizable response.


If that doesn't yield useful information, nmap ( www.insecure.org ) should.
 

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You can also try netstat -o (at the command prompt). Look for the line with something like localhost:80 (replace "localhost" with the name of your machine). There should also be a column marked "PID". This is the process ID of the process listening on port 80. Once you know that, pull up the task manager (probably control-alt-delete) and go to the Processes tab. If there isn't a column there for the PID, click View and Select Columns and check the box for PID. This should let you find the name of the program with that PID, and thus, the program that is running on port 80.
 

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I've used Zone Alarm to track down programs like this. Being a firewall, Zone Alarm naturally tells you when something tries to talk to your machine, but better yet (IMO) it also tells you when a program on your machine tries to use the network (either to communicate or to listen to a port). I trapped some adware that snuck onto my machine when it tried to phone home. The free version at www.zonealarm.com should do the trick.


Thunk
 
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