I receive the message:

(OS 10048)Only one usage of each socket address (protocol/network address/
is normally permitted.  : make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs

when starting APACHE 2.x

This is most likely one of 2 scenarios:

1. Running another webserver service such as IIS. Stop IIS and try again. Try stopping it from the services console or via the command line: c:\windows\system32\iisreset /stop
2. Running Skype. Exit Skype and try again.