Mouse randomly moves around and clicks

Ok, so ive had this problem for a few months now and it has led me to the point where my mac was in storage and i havent touched it in a month or two. What happens is no matter what i am doing my mouse will move around the screen clicking randomly and basically doing whatever it wants. i have looked into the problem and other people have similiar issues but not the same. i can be across the room from my mac with the screen on, and the mouse will still move around and click and open countless folders even though no one at all is even near the computer. today when i took the mac out to see if there was a software update available (which there was) the mouse was not moving around or jumping at all througout the entire update. After the update it is now yet again jumpin around and clicking wherever it wants. Also its not just once in a while it is 24/7 it has made my mac unable to be used because you cant really control the mouse for more than a second at a time. my whole screen is now full of untitled folders.... any help would be appreciated...

Hi - I am having exactly the same problem. I am going to do what Barry said. Apple support says to do the following:
Resetting PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Gene

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