Hello.  I just configured my new DIR-600 router and connected two computers, one wired and the other wirelessly.  The first one is a desktop with XP and the second one is a laptop with Vista.  Both computers connect without problem to the Internet.  If I ping either the router or the laptop from the desktop they respond correctly but the other way around it does not work.  Of course if I try to connect to a shared folder in the laptop I get an error message.  I already tried disabling the firewalls in both computers but still the laptop does not reply.  I hope somebody can help me with this problem.  Thanks in advance.