If you're running "Skype" from Microsoft, close it.
No just from the window, right click close/exit on the skype icon on the taskbar (in your clock) or kill the moth*** process in the task manager if you've been stucked for a while with this (it gave me some relief a few years ago), if works open skype and kill it again just to be sure.
If you're not running skype, try something from here:
http://www.sitepoint.com/unblock-port-80-on-windows-run-apache/
If you didn't click I will quote the article here:
The Obvious Candidates
There are a number of well-known Windows programs which use port 80:
IIS The most likely culprit is Microsoft Internet Information Server.
You can stop the service from the command line on Windows 7/Vista:
net stop was /y
or XP:
net stop iisadmin /y
SQL Server Reporting Services SSRS can remain active even if you
uninstall SQL Server. To stop the service:
Open SQL Server Configuration Manager.
Select “SQL Server Services” in the left-hand pane.
Double-click “SQL Server Reporting Services”.
Hit Stop.
Switch to the Service tab and set the Start Mode to “Manual”.
Skype Irritatingly, Skype can switch to port 80. To disable it, select
Tools > Options > Advanced > Connection then uncheck “Use port 80 and
443 as alternatives for incoming connections”. What’s Using Port 80?
Further detective work is necessary if IIS, SSRS and Skype are not to
blame. Enter the following on the command line:
netstat -ao
The active TCP addresses and ports will be listed — locate the line
with local address “0.0.0.0:80″ and note the PID value.
Now right-click the task bar and select Start Task Manager. Navigate
to the Processes tab and, if necessary, click View > Select Columns…
to ensure “PID (Process Identifier)” is checked. You can now locate
the PID you noted above. The description and properties should help
you determine which application is using the port.
The Task Manager allows you to kill the process, but be a little wary
about doing that — especially if it’s “NT Kernel & System”.
Microsoft-HTTPAPI/2.0
NT Kernel & System is an essential service. Stopping it will probably
stop Windows in a blue-screeny-like way. Therefore, enter the
following at the command line:
telnet 127.0.0.1 80
If you’re faced with a blank screen, type “GET” and hit return. The
chances are, you’ll see a line stating that Microsoft-HTTPAPI/2.0 is
listening on port 80. If that’s the case, open Services from
Administrative Tools and locate “Web Deployment Agent Service”. Stop
the service and set it’s startup type to “Manual”.
The Web Deployment Agent Service is deployed with WebMatrix and was
the cause of my woes. It may also be distributed with other
applications installed using Microsoft’s Web Platform Installer.
That caused me a few frustrating hours so I hope it solves your Apache
or WAMP start-up problems.
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