Nothing.
If OSX is getting online just fine, then a default Parallels install of XP takes nothing special. "Parallels networking" just piggy-backs on the current OSX connection.
Trash the install and start over.
Btw, you really SHOULD have a router. Without one, you are putting that XP machine out there on the net wide open - if you where in my neigorhood - I'd know about it.
Last edited: Sep 18, 2006