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: 
You may be having a driver issue if the above solution doesn't take you to any touchpad options. I know on a clean install on my dell laptop, my touchpad scroll didn't work until i reinstalled the driver. Acer drivers are available at <http://support.acer.com/Default.aspx>

To access your model go to Drivers & Downloads under the Service & Support link on the menu, install whatever you need under touchpads, and then "change mouse wheel settings" should work (again, if it doesn't already).
just hit Fn (function key) and F9 at the same time. Same thing happened to me. Couldn't figure it out for a year. Felt like an idiot when I found out how to turn it on again.