William_mk2 said:

@bluemoon2

Please look at the key f6 and f7 key on keyboard .    You can see the hand symbol with fingers .   That denotes the touchpad function key.   On some models it will be on f6 and some models it will be on f7.    So we need to use the right key depending upon the laptop model .   If fn + f7 is not working then we have to use f7 alone to make it to work.     

On some old laptop models there will be a separate button right  next to touch pad area which is beow the space bar.  It is used to turn on and off the touch pad.  On some old models it will be right next to power button.   On all new models, f7 key is used to enable and disable the touch pad. 

If you would like to disable and enable the touchpad, please press and hold  fn key on the keyboard and then press f6 or f7 once.    If the touchpad is not getting disabled you can either press f6 alone or f7 alone without holding the fn key.      It is used to enable or disable the touchpad..    

After disabling and enabling the touchpad check how it is working.. 

If it is still not working 
Go to support.acer.com 
chose your country 
type snid or chose your model 
go to drivers - Install the i/o drivers first and then install the touch pad driver 

egydiocoelho said:

what is the exact model? example ph315-52-58vh.

Aspire E5-576G