I was having the same problem.
None of the suggestions have worked.
However, I recently disabled 'taps' and that seems to have resolved the problem.
Right-click on the Alps Touchpad icon in the system tray
Click on 'Disable Taps'
Restart (not sure if this is required... but I did it)
Prior to doing this, my touchpad would hang for a second every 10 seconds. Pretty much unusable.
Now it seems to function properly.
Good luck. I hope this helps.
