I have just reinstalled Windows XP on one of my computers and now it does not appear in the list of computers on the network. I have tried with it connected wirelessly and connected via an ethernet cable. Using any of the computers including the "hidden" one all computers are listed except the one. Although hidden it is possible to share its files by mapping to a shared folder using the normal name for this computer. I've tried everything I can think of but I remain baffled. I've tried net config server hidden:no but that has no effect.