Touchpads are often disabled by accident with a shortcut key.
1. Check the touchpad key
Many laptops have an Fn key combination to turn the touchpad on/off.
2. Check settings
On Windows, Settings > Bluetooth & devices > Touchpad, and make sure it’s on.
3. Disconnect external mice
Some laptops disable the touchpad when a mouse is connected.
4. Update or reinstall the driver
Use Device Manager or the manufacturer’s support site.
5. Restart
A restart often fixes it.