i managed to install the drivers with the network adapter property dialog (installed both inf files as service): forgot to enable testsigning (thought i did this step before creating my first snapshot *doh*).
The is isDriverLoaded() Api call works with this method now.
But installing the drivers with the snetcfg.exe does not work for me 🙁
As far as i can see during the winpkflt installer there is some reading and writing of registry keys done. Is there any need for particular registry settings for getting the drivers working?
Thanks in advance,