Do you have any other program that also disables hot corners that may be interfering? Also, if you are using a laptop, the touchpad drivers may have enabled swipe gestures for Charms. If you wish to disable them, look in your Mouse Control Panel:
http://i.imgur.com/1ZUtn.pngAs an alternative, try this manual method of disabling them from the registry:
http://winaero.com/blog/how-to-disable- ... windows-8/ or download Winaero's Skip Metro Suite which disables the hot corners permanently till you restart.
You can also try Winaero Charms Killer:
http://winaero.com/comment.php?comment.news.219 instead of Skip Metro Suite.