Why won't this game run on my laptop?

Canyourunit is a worthless pile of crap. The problem is that you have a crappy Intel X4500 integrated turd. That thing can barely handle Minesweeper. That being said, hit the laptop manufacturer's website and grab the latest drivers. If you can play it then it'll have to be on minimal settings. Bear in mind that Frictional Games (the site you should have checked when looking at system requirements) says that integrated graphics may not work.