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touchpad mouse driver problem

touchpad mouse driver problem
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I've got an Acer 5315 Laptop. Pretty much all the drivers stayed installed during the upgrade from vista, with the exception of my ALPS touchpad. So i can't use the touchpad for scrolling, luckily it has a scroll key in between the mouse buttons. Nonetheless, this is a minor irritation. I tried running the setup file from Acer in compatability mode, to no avail. Also, W7 thinks that it's a PS/2 mouse, and won't let me update the driver.
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My touchpad stopped working after I had installed a usb mouse (and an IR remote). I searched numerous forums and tried everything out there with no success, including the following:
Tried the function key to turn touchpad on/off (the most obvious source of the problem)
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