Problems getting installed/working

Newbie here. I installed OpenFire 4.2.3 on my Windows 7 x64 PC. It installed fine, but when I click on Launch Admin, Firefox opens to: http://127.0.0.1:9090/index.html - it sits at “transferring data from 127.0.0.1” but never loads anything and the page stays blank. I tried both the package with Java and the one without Java. I also tried installing Java separately . What am I doing wrong?

I also tried: localhost:9090 and 192.168.1.2:9090 with the same results.

I guess this is already solved (based on chat)? Some other software used same port