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did you try the mouse on another computer or tried another mouse? What type of mouse? usb, wireless, ps2. Is it a ball type? If so, did you clean the ball and the small wheels inside If you use a mouse pad, has it been cleaned lately? Is it oem mouse or one you purchased? If purchased, did you install the software that came with it? Did you try reinstalling the driver? You can also go to the control panel and check your mouse settings.
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