Jumpy Cursors on Notebooks

On all my laptops I have suffered a jumpy cursor, worst by far of all now my Lenovo notebook G550. It wanders erratically and rapidly all over the screen. Within a minute it will jump backwards into an earlier part of the text or even another window and deposit/insert text into that point, sometimes even activating another icon from the taskbar.

It is not my dragging the heel of my palm or other body part nor touching anything beyond the intended keys.

Is there a cure? I can't find anything in the control panel to correct this.

 

Does it happen with a touchpad, trackpoint or mouse? Or all?

You can also try and see whether this option is enabled. This is in Control Panel, then Mouse in Win7, then under Snap to:

 

Thank you for your detailed, helpful suggestions.

I am not touching the touchpad nor is there an eraser nor is a mouse plugged in. It simply happens as I am typing in Word or in other w.p. such as email messaging.

I unclicked Snap To, this did not seem to affect the problem. I also slowed tried slowing the pointer speed (from about 3/4 to fast to 1/2) and then clicking the enhancing the precision box. Each of those helped but didn't cure the jumpy cursor when I tested it in Word and Firefox.

As I type this, the cursor is hovering around the right side of the page and jumps slightly when I hit the keys. It just wandered on its own down to the bottom of the page.

Am I on the right track? Thanks again

 

Hm no idea. I'd try disabling the trackpoint first, then tried to move a mouse (or a touchpad) and see where the problem is.

The only time when I had it jumpy on Thinkpad when I used it outside (it was cold, around -5 C but I don't know whether that mattered), and it started just going berserk. I restarted and it worked fine afterward.