I currently have a wireless router (home network) hookup for my 2 Macbooks. I think it's through the WAP connection. However, my dad wants me to add his computer to the network, he has an older Dell Inspiron (running Windows XP). I hate to say it, but he's pretty clueless with electronics and whenever he's had a PC he's managed to get several viruses (even with a lot of virus and spyware protection). If he does end up getting a virus or spyware junk while he's on the home network, will it travel to my computers?