If your laptop has a touchpad on it, then you could try a free utility called
TouchFreeze which disables the touchpad as you type. It was developed a while ago, as a method to prevent cursor jumping in laptops and for many users resolved the symptom you describe.
http://touchfreeze.net/
Worth a shot.
Other than that you could check whether driver updates for your keyboard and mouse if you have one, help.
By the way the symptoms you are describing occur for laptop users of Mac, Linux and Windows, so its not a issue directly related to the OS per se, hence my somewhat limited options above.
Someone else may have other ideas on what you could do.
Report back on how you go trying the above suggestions.