I have the same problem with Windows Server 2012 Standard, whatever I turn off, I keep getting that same error for port 80. I have tried the suggestion of doing a netstat and looking at the ID in Task Manager but all that gives me is System. Tried removing the IIS role completely and that got me nowhere as well.
Cant find "Web Deployment Service Agent" in the services list, maybe it has a new name.
Anyone have any ideas?
Problem resolved after doing the following
First, uninstall these components from the Control Panel:
a. FileMaker Server 13
c. All installed versions of Java
d. Microsoft Visual C++ 2012 Redistributable (if you see earlier versions of this, don't worry about those)
e. The four parts of the Application Request Routing application (if you don't see all four parts, remove what's there):
--Microsoft Application Request Routing 2.5 or 3.0 (either one)
--IIS URL Rewrite Module 2
--Microsoft External Cache Version 1 for IIS 7
--Microsoft Web Farm Framework
Stop all services that port 80 and 443 that are using or listening (this was a problem) Use Netstat -a in command prompt to find out what services are using port 80
Then reinstall from a full installer.