Can't disable touchpad

[Microsoft Windows]

I thought I had disabled the touchpad long ago. But now my cursor is jumping all over, and I tried to use the touchpad and sure enough it's active. And I can't possibly use the keyboard with the heel of my hand completely elevated. I looked in settings, and the disable option had vanished, while control panel's devices and bluetooth pad didn't see to add anything. But device manager did have one line that might be my touchpad: HIB-compliant touch pad. I found a setting there to disable. But it just won't take effect, even on reboot. I can't get any work done. Help?

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