Tivo does not get the guide data from the cable company, like TWC. Its guide comes from Tribune Media, which feeds a site, zap2it.com. You can see the guide there.
You may to re-run guided setup and choose the digital version, if its not done yet. There may be several versions available, such as analog, digital or both.
Series 2 (PLS, sold)
TiVo HD 1TB (157 HD Hrs, PLS, "652")
Roamio! Oh, wait, Its Juliet!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!