My path would be as follows:
uninstall subsonic
change router to point to another port [8080 is to common] try 9000
disable avg
reinstall subsonic
point it to the new port
open firewall port if not
run subsonic and see if you connect.
ps if you changed the port correctly http:\\localhost will not work unless it is like this:
http://localhost:9000
PS I sent you a PM...