I saw a topic exactly like this, but it was locked for some reason. 
Anyway, my touchpad isn't working and I'm pretty sure it's a software issue, because I messed around with the drivers and it worked for a bit (then stopped again).
I lost access to my tablet a couple of days ago, so I connected an old wireless mouse to my laptop in order to draw/do other things. Well, mysteriously, my touchpad stopped working. I removed the mouse, but it didn't help. I connected my iMac's wired mouse in order to use the computer.
Next thing I did was search HP's website for a Synaptics Touchpad driver update (my laptop is a HP Pavillion dv6 Notebook). I got a few, but they gave me "incompatible" error messages when I tried to install them.
Next, I uninstalled the touchpad drivers and allowed the computer to re-install and subsequently update them. A Synaptics icon appeared in my icon tray or whatever it's called. For a while, both my touchpad and mouse worked together.
Today, my touchpad stopped working again, and the Synaptics icon no longer appears.
I have no idea what's going on. Can anyone offer some insight?
