Then it may be because of your laptop's touchpad drivers. Look in the Mouse Control Panel to see if there is a way to disable the touch gestures - it is very likely that there will be a setting there to disable it. I have for my touchpad vendor but it can vary by manufacturer. Here are two common touchpad vendors' control panels (integrated with the Windows mouse control panel):
You can also try Skip Metro Suite: http://winaero.com/comment.php?comment.news.103 which kills the Charms hidden window at startup.
On Windows 8.1, you can try Winaero Charms Killer: http://winaero.com/comment.php?comment.news.219 instead of Skip Metro Suite.