Hi there,
i just spent a few hours researching the above mentioned problem and did not really find a suitable explanation using google.
Problem is:
Windows 7 openvpn gui (OpenVPN 2.4.1) crashes the whole system with bluescreen directly after successfull connecting to openvpn server.
Solution in my case:
The Windows 7 boxes had the FritzBox AVM vpn-drivers installed, which seemingly are not compatible with openvpn.
I deinstalled AVM vpn-drivers following (
https://avm.de/service/fritzbox/fritzbox-7390/wissensdatenbank/publication/show/221_Fehlermeldung-Der-AVM-VPN-Driver-konnte-nicht-gefunden-werden/) and now it works perfectly.
Regards,
Volker