I had a home network which consisted of a xp pc, xp laptop, and a vista laptop. It failed and I have not been able to get it working again. I can ping each of my laptops from my pc, but I cannot ping my pc from either of the laptops. I have disabled the firewall of my pc and even uninstalled my firewall on my pc and I still cannot ping my pc from the laptops. What could be blocking my signal when I ping the pc?