Another process is listenig on port 80.
You can get the name of the program
in a command window (cmd.exe, run as Administrator)
with:
netstat -a -n -b -p tcp | more
Look for lines with
0.0.0.0:80 .
Either another instance of Apache httpd is active, or you have Microsoft
IIS installed and active.
80 is the default port for httpd, so the best thing to do is make sure
Apache httpd is only started once, and disable the IIS service in the
Windows management console.
If you really want to use another port, you can change the Listen
directive in your httpd.conf or one of its include files.
http://httpd.apache.org/docs/2.4/bind.html
--
Regards,
Kees Nuyt