don't disable firewall - open ports UDP 1870 and TCP 1871 in your firewall...also do at Routers firewall (if any)
you might also make an exeption in AV program for java.exe and javaw.exe
@Artemis
Your Notebook is very special!

with a personality of its own

but great you found a workaround!
I can't recommend to use older versions of Java 6 or 7 for everyone as there are exploits that have been fixed in actual updates!
And i don't think that having the Java updated version installed is the reason for HnH not running - mostly it's some programs or settings...