Indeed..Same problem on inherited Toshiba C850-BLU.
I followed your process step by step and it totally worked as long as you don't try to skip parts of the directions. If you want to make it work, do it exactly as the process Jack4all directs. Believe me, I tried to leave out a step and it didn't work.
Thank you so much. I thought the machine was needing junk pile if no on board mouse...but I re-read your directions and followed exactly the second time and it totally worked!!!!!. Now we have a working mouse pad on a 64bit laptop. T YVM!