If you uninstall RAS, your System Event Log may contain the following (when you restart):
Source : TCP/IP
Description: IP could not open registry key for NdiswanX.</b>
Source : NetBT
Description: Initialization failed because the driver device could not be created.</b>
Double-click the Adapters key and delete all sub-keys that starts with NdisWan.
Shutdown and restart your computer.