New
#101
Speculative suggestion- if you can see that in the registry a setting changes to disable the touchpad, I wonder if you could change permissions on that key, effectively protecting it.
Otherwise, assuming something writes to the registry, you could try monitoring that key to find out what it is.
You mentioned at one point that you had installed an older driver and it worked. Are you sure Windows did not update that driver? (You can try to protect drivers by hiding - disabling updates- provided you can intercept them).