You would want to determine if its the their is a problem with the touchscreen itself, or if it's software issue. I its a software issue you could restore your computer or reinstall Windows, and that'll rule out like a software or a driver issue. But if the touchscreen is malfunctioning, and there's been some sort of damage or liquid damage or physical damage, you may just need to order a new touchscreen. But usually you can determine if it's usually either going to be the touchscreen itself, or it's going to be software, and a reinstall can roll out software.