I am running 2 computers on my network. A Dell Vostro 200 running windows vista home basic. the other A HP Pavillion running Xp Home. I have downloaded the mapping program for the xp to map vista. My router is a D-link DI-604. I can ping the vista computer from the xp, but I cannot ping the xp computer from the vista, and cannot get either computer to see each other. What am I doing wrong???