For unknown reasons, the Wan miniport(s) available with Windows 7/8 could start showing errors & giving the user no apparent solutions to fix them, including uninstalling them.
I had the same situation when all of a sudden one of my PPTP connections started giving errors like “Device disconnected”, properties for the PPTP connection not shown and not allowing me to delete the connection in the corrupt state.
After few attempts, I came across a workable solution, posted with Microsoft support site. Unfortunately, this time I forgot to bookmark the page, however, still remember the entire steps. Please find them listed below
View – > Show hidden devices
Right click the Wan Miniport device with yellow exclamation mark
(Enlarge the images for more details)
Now force install the driver. Once the installation is over, you can safely uninstall this device. Follow the same for all the Miniport devices those are showing the exclamation mark. Once you are done with the uninstall processes, don’t do anything else. Just restart the computer and start creating the VPN connections once again.
The above exercises must have fixed the Wan miniport issues for you.
As Microsoft is continuously updating their technical preview for Windows 10, we are sure many of you out there are trying out the latest release 10074, that adds(?) many features. As a precaution, we always use Oracle VirtualBox for testing such releases and never had more issues than with the pre-releases of Windows 10!
One of the regular errors we came across were about “Unable to allocate and lock memory” while the VM started, and gradually pops up another window titled “Guru Meditation”, asking us to view the log files (/me chuckles, when Google can do that for us). We came across a wonderful post, that explains how to resolve this particular dreadful situation with VMs!
and here we are linking the same POST for you! Enjoy and Enjoy your Windows 10 VM