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What is needed to enable it again?

I have installed the synaptic drivers from acers homepage but it did't do anything but add a useless tab to the mouse settings in control panel. (which SHOULD contain the settings for multitouch but doesnt)

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I reinstalled since updating has never really worked out well for me before. – Richard Oct 31 '12 at 15:55
Try installing the Win7 drivers from Synaptics's website. The Acer site might not point to the latest. – Anirudh Ramanathan Oct 31 '12 at 16:07
Are you sure your system has the Synaptic hardware and not the Elantech? – ernie Oct 31 '12 at 16:13
I had a similar problem with my Mac.… – mcandre Nov 4 '12 at 4:20
up vote 3 down vote accepted

Acer updated their site with the drivers for Win8 for those of us upgrading so you should be able to find the appropriate drivers there (note that those on Synaptics' site are outdated).

Also, as @ernie mentioned, you should probably be using Elantech's drivers (those at least were the ones working for my S3-951).

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Elantech drivers solves it. Thanks. – Richard Nov 4 '12 at 16:36

Downgrade the drivers, then reupgrade them:

  1. Open Device Manager.
  2. Uninstall all drivers for the trackpad devices.
  3. Install Generic USB Device drivers for the trackpad devices.
  4. Test trackpad for basic functionality (move cursor + left click).
  5. Use the search function to finally upgrade the trackpad devices.
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