Tightslot, welcome to the bright side! No expert me, but how are the other PC's networked? Wireless or Ethernet? I still have some issues with the PC, mainly getting the printer recognised, but I remember feeling fairly foolish at the beginning when I discovered all my wailing and gnashing of teeth was silenced by going to System Preferences (Apple version of Control Panel) > Network. Everything you need should be there.
P.S. I found a lot of useful help here when I converted:
http://www.pprune.org/forums/showthr...light=converts