Click on the Start button at the bottom left of your screen. Open the Control Panel by either typing it in and finding it and hitting enter or clicking on it. Go to Hardware & Sounds then Devices and Printers and finally Mouse. From there there should be a tab called "trackpad" or "touchpad". You should see either "Disable internal pointing device when external USB pointing device is attached" or "Disable when external USB pointing device plug in" You want to uncheck that.
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