Getting late here and I didn't see what Windows version your using with a quick scan of the thread, but here's a link.
There looks to be a couple of other interesting articles in this list.

Edit: I'm not all that up to speed on the wireless stuff, but IIRC its a device that is radio in one end and ethernet in the other. So you could hook it with a short ethernet wire to teh Tivo and then have it talk wirelessly to the router direct, just like the computer, and not have to go through the computer and ICS.

/Michael