6. Unplug all peripherals
Sometimes, the mouse pointer issue may be due to peripheral conflicts. To fix that, unplug all the peripherals connected to your PC, including your mouse.
Then turn off your computer and then restart it. Once your PC has rebooted, connect your mouse and see if it works properly.
Continue to connect all the other peripherals one by one. If there are any compatibility issues, you should be able to quickly identify the culprit.