When trying to execute httpd.exe on my windows server, I get this error:
(OS 10048)Only one usage of each socket address (protocol/network address/port)
Confirm if some other process is already listening to Port 80.
netstat -aon | findstr :80
Since it is windows server there are chances to have IIS running by default.
You will have to stop the website binded with port 80 from IIS Manager and then run httpd.exe again.