Note: After performing these steps you will lose all access to your touchpad.
To turn off your touchpad, please follow these steps.
Step 1. Click on windows icon Settings > Devices > Touchpad
Step 2: Toggle the Touchpad to Off
Step 1. Right-click Start/window
Step 2. From the list of results click Device Manager
Step 3. Select Human Interface Devices, open drop-down list
Step 4. Right-click HID-complaint touchpad
Step 5. In the menu that pops, click on disable device
Warning: Downloading software from unknown sources may cause the device not to work correctly, or sometimes even infect your PC. Download at your own risk
If you’re looking for a way to disable the touchpad temporary to prevent accidentally changing the mouse cursor position that happens when your palm or wrist touches the touchpad while typing, you may like to try the program Touchfreeze.
In simple words, when Touchfreeze is running, it locks the touchpad for a very small period after hitting a key.
You may download it from the link below.