There are several ways to check what's on TV from your computer. This is a desktop client that seems to do it well. Developer's description: "TV-Browser gets the daily TV program from the internet and shows it clearly arranged - like a printed TV guide. An internet connection is only necessary during the data update."
Get TV-Browser
Follow me on Twitter. Barry's Best Computer Tips is updated often; the easiest way to get your regular dose is by subscribing to our news feed. Stay on top of all our updates by subscribing now via RSS or Email.