This method is known to resolve many issues, software or hardware-related. Disconnect the charger (or AC adapter) and remove the battery while your device is turned on and insert it after 5 minutes. Then, the touch screen should start working properly.
Note: If your device's battery is non-removable, press and hold the power button until it turns off.
If the touch screen is dirty, it won't recognize your gestures. Take a soft cloth and a cleaning compound, which you can buy in a computer shop, and clean the touch screen gently.
Maybe your computer is slow and it processes the touch gestures slowly. Try optimizing it using utility softwares.
See the computer is slow guide to learn more ways of improving your computer's performance.
Maybe a virus which infected your computer has damaged your computer's drivers. Try scanning your computer with an antivirus software and remove the viruses, if any.
See the viruses/spyware/malware guide to learn how to scan for viruses and protect your computer against them.
Maybe your computer is unabe to recognize the touch-screen gestures because the appropriate driver is not install. Installing the drivers is a must, if you want your computer (laptop) to work flawlessly and recognise the devices which are part of it or are connected to it.
See the don't know how to download and install drivers guide or don't know how to update drivers guide to learn how to download, install or update drivers.
Maybe your computer's "Human Interface Devices" USB ports are disabled. All you have to do is to enable the USB ports via the device manager.
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