You need to disable the touchpad and use an external mouse while you are typing. On my laptop, I hold down the function key and press the F6 key, but your Acer may be different - check the user manual to find out how to do this.
I don't think I'm brushing the touch pad, although it is all much more sensitive than my desktop system.
I'll give your suggestion a try, Archie, but surely it shouldn't be necessary to plug in a mouse to enable the system to be used correctly. It's a mid-range Acer ( £600).