You need to have a network. Therefore, you need to buy a router -- either wired or wireless.
Connect the router to your modem.
Then you need to connect both the TiVo and the computer to the router. If you want to go wireless, you need wireless adaptors for both the computer and the TiVo (TiVo sells their own for use with the TiVo which is very good). If you want to go wired, you need to get a USB-to-ethernet adaptor so that you can plug the network cable into the TiVo.
TiVo.com has plenty of detailed information about this.
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