This problem is usual because the driver may not be updated to latest version. To do this please follow this video.
If your problem is not solved by applying above methods, then follow these steps 1. Go to this website Dell series. 2.Choose your device model from that link. 3.Choose your touch pad driver from that page. 4.Get the updated one from that list. 5.Install it after that please restart. Your problem will be fixed.
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