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Is your cursor teleporting or stuttering across the screen? This is usually a sensor or surface issue, not a virus.
Flip your mouse over. Use a Q-tip or compressed air to gently clean the sensor hole. Even a generic hair or speck of dust can cause the sensor to lose tracking and 'jump'.
Optical sensors struggle on glass or highly reflective surfaces. Try using a mousepad or even a piece of paper to see if the jumping stops.
Go to Mouse Settings > Pointer Options. Uncheck Enhance pointer precision. This feature (mouse acceleration) can sometimes cause erratic movement if the sensor is high-DPI.
If your cursor flies to the ceiling when you swipe fast, you are experiencing 'Spinout'. This happens with older sensors (like 3310 or office mice) that cannot handle the acceleration.
The Tilt-Slam Test: Lift your mouse, tilt it slightly, and slam it down while swiping. A good sensor will track normally. A bad sensor will lose control.
Does your cursor move in perfectly straight lines? This is 'Angle Snapping', a feature for office work that ruins gaming accuracy.
Open Paint and draw circles. If they look like squares or straight lines, check your mouse software to disable 'Angle Snapping' or 'Prediction'.