Acer "aspire 3680"

hi dear

What happens if you unplug your microphone?

No, I'm not joking. Several users have found that erratic mouse movements
were caused by their voice-recognition software trying to make sense of
random sounds coming in through the sound card, and feed those signals to
the mouse driver.

If that's not it, then fall back on the old faithful: make sure you have
the latest and best driver for your mouse. If you tell us the make and
model, there's a good chance that someone here will recognize it and know
which driver you should be using. (Of course, it could be a small defect in
the cable, too.)