ok, so spireil over at cgtalk helped me find out:
it was the missing or to old opencl.dllok... so here for all:install like described in the Navie effex zip- copy a tpp.dll to the dir where you find the cinema4d.exe (working for me is version 4.2.2013.1114 for spireil version 2018.0.0.0 works, maybe wersion it is not that crucial here)- take care that your windows/system32 folder contains a opencl.dll (version 2.0.2.0 works for spireil, 2.0.4.0 works for me (I had it laying around so I used this one.)thanks a lot to everyone!and especially to Samir!