Aspire S5 - 391: Touchpad not in Device Manager, does not!

I'm not sure what I've done - the touchpad was behaving VERY badly, I tried to download and reinstall the drivers (used Synaptics because I couldn't tell what was on my machine)... but now I have nothing:

running Windows 7

Under "Input" in the system information (not Device Manager) - "Keyboard" a USB Input Device (Logitech Download Assistant) [this is a Logitech M505 mouse USB Bluetooth - integrated USB Atheros has not worked in years] and Standard PS/2 keyboard. "Pointing device" has only the HID-compliant mouse (driver is mouhid.sys). Nothing for the PS/2 compatible mouse, or any what touchpad.

With the system diagnostics, I get the following:

Symptom:


Tags: Acer Laptops

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