Sometimes Windows 7 refuses to reinstall the driver because it believes the device is still present. This requires a manual cleanup.
The WAN Miniport is a critical component for internet connectivity beyond your local network. In Windows 7, it is most frequently used for and DSL (PPPoE) connections. wan miniport windows 7
A WAN (Wide Area Network) Miniport is a software component that allows a computer to connect to a wide area network, such as the internet, using a dial-up or broadband connection. In essence, it's a virtual device that enables your computer to establish a connection to a remote network. Sometimes Windows 7 refuses to reinstall the driver