Desktop or laptop? The reason I ask, I have used laptops for the last several years, and I was having erratic operations, just like you describe. I finally realized the TAP function on the touch pad was on, and my thumbs were occasionally hitting the touch pad and depending on where the pointer was taking that action. Go to control panel, and select mouse, and then go to the settings for the touch pad, and turn of tapping.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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