Are you sure you selected the correct line-up during guided setup?
Here's a link from TiVo about missing channels: http://customersupport.tivo.com/LaunchContent.aspx?CID=5a545f57-f407-4c4c-a420-c7988fe596c3
I'd try a couple different line-ups, and if the channels do not appear you can ask TiVo to investigate and correct your line-up. The page I linked to has the e-mail address to use.
Here's a link from TiVo about missing channels: http://customersupport.tivo.com/LaunchContent.aspx?CID=5a545f57-f407-4c4c-a420-c7988fe596c3
I'd try a couple different line-ups, and if the channels do not appear you can ask TiVo to investigate and correct your line-up. The page I linked to has the e-mail address to use.