Assuming that you are using Windows XP as a bridge, and you are getting ip addresses handed out by your router, you should be able to log into the router and find out what IP address has been assigned to your TiVo.
If however Windows XP is handing out DHCP stuff, then I would check to see what range XP sets (which I seem to remember is 192.168.0.x if you turn on ICS -- Internet Connection Sharing)
Hopefully this will give you a leg up in finding your TiVo's IP address.
Worse comes to worse, you could always hit "Redo Guided Setup" from the "Messages and Setup" menu somewheres.
Cheers
Ex Tivo Owner.
Philips Tivo
Version 1.3 Emulator Image from Minnie
200Gig Western Digital HDD
No Turbonet or Cachecard
Slices: Cable Digital FTA
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