WampServer

I just installed wamp and had to fight with it for an hour or so before I found that the <install>\apache2\conf\httpd.conf file that was generated was messed up. It was actually the same block of 965 lines repeated 3 times. Once I cleaned away the duplicate lines I found that I could finally install/start my apache service.

If you're having problems getting apache to start, you don't have a firewall, and nothing is binding to port 80 try checking your httpd.conf file to make sure you aren't having the same problem I was.