I had the same problem and worked around it without uninstalling all the oracle software
My solution was similar
-disable ipv6 stuff
-wiped out ::1 from hostsfile and inserted "ip fqhn hostname"
-emctl stop oms && emctl start oms
-secured the agent manually
-finished the installation successful
A year later - and we are still waiting for a newer version. Thanks to all for giving me clues on what needs to be done - since support is useless.
After about 12 hours, I just completed the nightmare of successfully installing 11g GC on a 2008R2 64-bit server, with 18.104.22.168 - and am still wondering about what the next DoD security audit will think about running such an old version of WLS/Java.
So when do we get a 12c version of GC on Windows to support modern (patched) versions?