The Mouse Synaptics Touchpad program should be in your recovery Acer CD.
If you are using Window XP at default settings, you might not see the mouse in your “CONTROL PANEL”.
Click Control Panel, go to the top, click “TOOLS” and then “FOLDER OPTIONS”.
SELECT “USE WINDOWS CLASSIC FOLDERS” and click “OK”.
You should see the Mouse Icon.
You can go to Acer and download the program. I was able to find Aspire 5100 not sure if that is what you need. Below is the...