well you should have came here when you had the problems, all the fixes have been deleted. the "contact us" button on the blue bar at the bottom of page is suppose to work still.
if i recall correct, you have to log in to nova to play is one error fix.
and then there is a firewall port the host has to have open for others to join.
and on vista/win7 the user must have admin rights for the game have admin rights to do what it needs to do to connect. or "run as admin".