Click on the hard drive labeled "ACER" or "C:". This is your hard drive, where most files are stored.
Scroll down until you see a folder called "Program Files". This is where programs, like Firefox and Google Chrome, store their data
Look for a folder called "Launch Manager". This folder has all the data for the popup display that appears when you push Fn and another key
Inside "Launch Manager", there will be two folders of interest. MMRes and OSDRC
When you find the picture in the folder you want to change, first make a copy
When you are done, make sure there is a backup copy of the original pictures and that everything is saved. Close the folder
Go to Task Manager [Ctrl + Shift + Esc] and go to the "Processes" tab
You can also get technical help by visiting our site http://acer.supportnumberaustralia.com/