WAN Miniport accidently deleted; unable to reinstall

The core problem is that I am no longer able to connect via RAS/VPN to my company network, it says - Error 651: The modem (or other connecting device) has reported an error. I am 99% sure this is caused by crashed WAN Miniport devices.
What I did: In device manager (network), 3 WAN Miniport (xxx) devices shown exclamation mark. Not sure what caused this, but I assume I made a mistake while making some experiments with Windows 8 Networking. I tried to repair. One of the first hints I found
by googling was to uninstall the WAN Miniport devices completely before reinstall. Trying this I failed, and more googling thrown the answer that I first need to assigned 'wrong' drivers to these devices. I've done this, and finally these devices could be
uninstalled.
But now I fail to reinstall them, whatever I try. I tried e.g.
this but here the Add Hardware wizard doesnt find the missing WAN Miniports. I am stuck. Whatever help I find, at least one of the necessary steps doesnt work.
I depend on this Dialup RAS Connection, it makes my VPN tunnel to my company.
Please help, I have no more ideas...
Thanks, Marc

Hello, is there nobody who can help? No workaround for uninstalling these WAN Miniport devices? Is it necessary at all to uninstall the remaining WAN Miniport devices, or can I continue with the (already killed and missing) 3 WAN Miniport devices?
Please, any help is highly appreciated!
Thanks, Marc
Hi, Me too is facing the exact issue as Marc i have also deleted the following:
WAN minport (IP)
WAN minport (IPv6)
WAN minport (L2tp)
WAN minport (Network Monitor)
WAN minport (PPPoE)
WAN minport (PPTP)
except the fact i am on win7 64 bit os. and my wifi is gone completely and on suing troubleshooter i have got the error of DNS server not found which i am sure due to these deleted  miniports. Any help to get these drivers back on would be highly appreciated.
Rgds,
Sum1spl

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