Question: I have an Acer Aspire 5532, and it used to have a scroll option on it, on the side of the touchpad. I used a regular mouse plugged into the USB drive for a while, with the touchpad disabled, but it broke and I'm back to using the regular touchpad. however, somehow the scroll option got disabled and after quite a bit of trying I still can't figure out how to re-enable it. does anyone know how?

Answer: 
In Windows 7, you can go into the start menu and type "change mouse wheel settings" and you should be able to edit your touchpad's settings there.
I had the same problem in Win7 x64. I used the `TouchPad_Synaptics_15.0.12.0_W7x64_A.zip` driver straight from Acers driver download site for my Acer Aspire 5745PG. When I installed the driver by using the first setup.exe within the folder after extraction. I didn't have the scroll feature for my touchpad even though there is a scroll bar on the right side of the screen.

Solution:

* Uninstall the driver from within Device Manager with the option to delete the files.
* Reboot.
* After Rebooting in device manager you should see under mouse 2 devices. 1 is the HID-compliant mouse and 2 the PS2 port Touchpad.
* Now to reinstall the driver.
* Use the setup.exe located within the x64 driver directory instead of the one in root directory for the drivers installation.

Voilà! The scroll now works.