I had the exact same problem after upgrading to windows 7 32 bit Home Premium on my Acer 3680 series laptop. After researching the problem at both the Acer site and the touchpad manufacturer's site, I discovered that sometimes Windows 7 doesn't support all features of older touchpads and there is no solution for this problem (which I like, anyway).
The drivers for the original touchpad are not always supported by Windows 7, which say, for instance, worked in Vista.
I tried emulation mode, etc., but the scroll buttons didn't work after updating to windows 7.
So, I just gave up and tried to adapt to the new operating system/touchpad function.
Good luck on this one.
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