Good morning!!!!!!!!!!!!!
From all the advises mention none of them is working for my problem, maybe because mine is a different brand which is a TOSHIBA, but I had already fixed it by following these steps;
1. click the start button
2. type the word mouse in the searching box
3. click on the change mouse setting
4. click on the device setting button
5. click on the enable button below the small box
6. click on the APPLY button
7. click on the OK button
Then finally your touchpad will start working again
I hope these steps will help you out with your problem