My acer aspire 5100 as put me into trouble

use a USB keyboard and enter set up to verify if your touch pad and keys have been enable. if not enable it. if the problem is not solve, replace the keyboard or use external keyboard and mouse

borrow a friends keyboard and mouse...log on to your computer and go to system restore and go back to a time when you knew you could use them and restore to that date

sometimes funny updates cause external hardwares to act up

Brentwood IT

On an Acer, the Fn key plus F7 will turn the touchpad on and off.
Try that to see if it works.

I would check the Flex cable's first. If keyboard is not working sometimes this does not allow the pad to work. Here is one of the sites I use for repairs. Good luck and have a good day.
http://www.insidemylaptop.com/taking-apart-acer-aspire-5100-laptop/

usb is tyed in to the mouse and active key both below the mouse pad got same problem

try removing the battery and restart only using the mains lead. it worked on my aspire 5600

have k/b and touch pad been disabled in BIOS?

This is generally a driver glitch. You will need to use an external keyboard and mouse, in order to uninstall the drivers for the onboard keyboard and mouse from the device manager, then disconnect the externals and reboot. The machine will find and reinstall the drivers for them automatically. If this doesn't work, then the problem is with the motherboard and you will need to have it serviced.

kINDLY CONNECT A USB KEYBOARD AND/OR MOUSE TO TROUBLESHOOT THE NOTE BOOK IF USB KEYBOARD/ MOUSE (EXTERNAL NORMAL USB DESKTOP KEYBOARD MOUSE). THEN WE WILL BE ABLE TO TROUBLE SHOOT

function and f7 key is its locked mouse pad or
refix keyboard and touchpad conectors