If you uninstall RAS, your System Event Log may contain the following (when you restart):

Event ID   : 4119                              Source     : TCP/IP                              Description: IP could not open registry key for NdiswanX.
        or
Event ID   : 4311                              Source     : NetBT                              Description: Initialization failed because the driver device could not be created.
To fix the problem, use Regedt32 to navigate to:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NetBt\Adapters

Double-click the Adapters key and delete all sub-keys that starts with NdisWan.

Shutdown and restart your computer.