The main cause is most probably the touchpad of your notebook computer, because it is too sensitive. If you are using a mouse most of the time, you probably don't need the touchpad. This following short 2-minute video shows you how to disable the touchpad when using a mouse.
For those who are used to using mouse, you don't really need the touchpad, just as the author do. However, there could be times when your mouse runs out of battery, or when you forget your mouse while working outside. If you have disabled your touchpad, it could cause another headache because it becomes extremely difficult for you to enter the graphic interface of control panel and re-enable the touchpad.
Note that in the last part of this video, it also tells you how to enter the control panel and re-enable your touchpad without a mouse. When you decide to do this, you should also pay attention to this part of the video too.