If by Touchpad you mean the Gemstone Blue Audio Controls on an Acer laptop then there is a fix which I was apprehensive about but it did do the trick.
Step1: Have laptop fully running
Step2: Remove Charger
Step3: Swiftly remove the battery from the laptop
Step4: Replace the battery
This should work 100%, it worked for me, I have an Acer Aspire 6920G Laptop