You are looking for to delete the cached password stored by CVSNT in the registry editor ??, This is your solution !!, this is a Registry Monitor designed for this, monitor a registry key and delete it after a configurable time.
Sniper is a powerful keylogger component that can be easily integrated in applications. It is a small,easy-to-use ActiveX control that encapsulates all the complexity for logging keys and exposes a few important properties and methods.
The Winfessor Enhanced .NET Trace Library is written in VB.NET, supports class level configuration, and contains both console and Winforms trace receiver interfaces. To use it you simply put a Traceable attribute on your class and call a static method.