I would like to add that on some computers (not all, for some reason some it will do it correctly by just doing the 'install/setup' from synaptics), you will have to manually override the installation behavior. Go to Device manager, and do a manual search/install of the driver,(including searching for the right driver, which you should have downloaded and put somewhere you can find easily), it will come up with a 'its not a signed driver and windows doesn't recommend' or some such thing, tell it do to it regardless, then restart after it has finished installing. At that point the synaptics driver should be installed in your system and allow you to do the disable if it detects external mouse. I find it annoying that synaptics has essentially abdicated their responsibility to the end user (I know that these are OEM devices but the end user will be the one dealing with these things after warranty is over). No contact email so I couldn't update them of their FAQ inaccuracies and since it took me a day to find this forum now I don't fully remember all the steps. Still, it should be fairly self evident what needs to follow when you do the above.

Sep 14, 2015  Windows 10 Synaptics Touchpad Driver updated 7/21/2015 My Laptop is an Acer Aspire S7-392-9890 with a Driver date of 7/21/2015. The Touchpad works until I evoke the Start Menu.

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- Examples: “SL-M2020W/XAA” • Include keywords along with product name. Examples: 'LaserJet Pro P1102 paper jam', 'EliteBook 840 G3 bios update' Need help finding your product name or product number? A TouchPad or ClickPad is a pointing device with a touch-sensitive surface located on the palm rest of the notebook. On some notebooks, the right side of the TouchPad has a vertical line that indicates a scroll function. Additionally, two or more buttons that function as left and right buttons on a conventional mouse pointing device usually accompany the TouchPad. On ClickPads, taping the lower left or lower right corners functions as left or right buttons on a conventional mouse pointing device.