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I frequently have the same thing when using a Dell laptop. The problem MAY be with the touch pad. Without noticing it, my thumb touches the pad and away goes the cursor!
So try this: Open the control panel and go to mouse. Look at the top for Touchpad. There is a setting in there for sensitivity. Reduce the setting so that you need to apply more pressure on the touch pad to move the cursor. Test it a few times to make sure it is still functional before closing the control panel. Then try typing something in a word processor and see if it is any better.
Go to my computer, right click>properties>hardware tab>device manager, then look down the list for mice and pointing devices, click the '+' sign and right click on your touchpad and select uninstall, do the same on the keyboard line and then restart the pc.
Both touchpad and keyboard will be reinstalled and then ready to use again as it should be back to normal
Most probably because your 'Touch Pad Mouse' is touched by your palm (hand or something) while you are typing. Avoid contact with the mouse touch pad while typing.
If you have a centre moveable mouse on your laptop, start using it and disable the 'Touch pad mouse'
Best of luck!