I've finally fixed it!
All it was is that Visual C++ Redistributable Packages don't come pre-installed,
as I don't play games often I haven't installed any which usually automatically install
Having another issue, with maya2018, tried what u mentioned, no succes.
GPU : R290x 3GB
PC : intel core i5 4Ghz 8Gig ram
Windows 10 64-bit
Latest prorender plugin, also installed new drivers 18.3.4 today to give it a try, and in the end even did a 100% clean install of drivers, software,... the long run
after adding an object, activated prorender, all ok.
after adding a second object, virwport goes black wichever i choose where prorender is activated. when i remove 1 of the 2 objects, no matter wich one, the other appears again??
Tried with lights, materials, ... no succes.
Same plugin version tested on blender all works well.
anyone else having similar problems with regular gpu and drivers
Ty to all who can help out already