Make sure that your LW isn't using the same listening port as your husband's LW. In LW, go tools > options > advanced > firewall... there you'll see LW's listening port. Try changing to a port in the range of 49152 - 65535 (eg 65000) > apply > ok.
If that doesn't help, try the other fixes in this thread:
If LW Will Not Connect
If nothing there helps, that thread has info about the system details that we need (scroll to the bottom of the thread)