While in control Panel; System>Hardware tab>Device Manager>View>Show hidden devices, Click the Plus sign in front of Network adapters expanding all network devices. Look down the list and find WAN Miniport (PPTP) and right-click on it. Select "Uninstall" then OK a few times until the windows closes. It is gone.
Remember, if you remove this device, don't come back here crying looking for the way to put it back.
I'll tell you, but you are forever banned from coming back to ask how to put it back.
If this device is not completely crashing your system to the point it cannot be started, then it is ignorant to remove it.
Look down the list and find WAN Miniport (PPTP) and right-click on it. Select "Uninstall" then OK a few times until the windows closes. It is gone.
I've followed your instructions above, and unfortunately none of the eight (8) Wan Miniports respond to a removal attempt. I also have a RAS Async Adapter which won't respond to removal commands. And I have ISATAP and Teredo "pseudo-interfaces" which spawn indefinitely if I disable them (obviously, they don't respond to removal commands either).
Windows 8 still had them on my systems. In Windows 8.1 they're gone.