Dial-Up Network
Internet Connection Utility
Freeware

Latest version of the Microsoft Dial-Up Networking adapter.  Use this newest version if your current version is giving you problems.

The most recent DUN release includes several performance and security improvements for better Virtual Private Networking.  Performance improvements will only be experienced when a DUN client connects with a similarly updated Windows NT server configured to support VPN. If either the server or the client have not been updated, the connection will revert to the behavior and performance provided by the original PPTP specification.