If you can't trace the application or driver causing it to re-enable, then what you can do is disable write permissions to that registry key.
Although, I don't know what kind of consequences this will have with the other entries in the key....
- Right-Click the key, click permissions.
- Click advanced, uncheck the box for "inherit from parent the permission entries that apply to child objects.
- Click remove on the popup window after unchecking, the permission entries should be blank now.
- Click on add, click on advanced, click on find now - highlight system and click ok, then click ok again.
- You should be at the permission entry window, click on deny for Full Control, then click on allow for Query Value, then check the box at the bottom for "apply these permissions to objects and/or containers within this container only", click ok.
- Repeat the previous two steps and apply the same permissions for the Administrators group.
This will effectively deny the system or process acting on the administrators behalf to change any entry inside this key.
Hope this helps!