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Synaptic touchpad can't kill "Tap to Click" - Acer Aspire 5741
I just had to replace the top cover, including touchpad, on an Acer 5741 running Windows 7 64 Home Premium. The cover appears identical to the old one, and everything works, but the symantics touchpad software doesn't recognize the touchpad as a touchpad; it shows as a "wheel mouse on PS/2 port". Therefore, I can't turn off the incredibly annoying "tap to click" function. The option to disable tap to click is grayed out... it appears that's because the touch pad is seen as a "mouse" not a touch pad, as it was before.
When no drivers are installed, Device Manager just sees it as a PS2 Mouse. When drivers are installed, Device Manager sees it as Synaptics PS/2 Port Touchpad.
Acer identifies three manufacturers of touchpads on the 5741 on its support website. I have tried all three; ALPS, Synaptics, and Elan; the Synaptics drivers install and work as above; ALPs installs but doesn't provide any control, and Elan doesn't even install.
At the recommendation of the vendor of the laptop cover, I tried a site called "magicdriver" to help identify the hardware, since Windows apparently does that based on the drivers. It does appear to be a synaptic touchpad based on "hardware ID" under properties, details, via device manager.
The OS is entirely up to date. I have tried the latest Synaptics drivers, I have tried using the original driver version that came with the laptop, and I have tried a couple of versions in between.
Does anyone have any suggestions on how I might correct this? Are there any utilities that I can use to kill "tap to click" generally? Anything in the registry?
Thanks!