I would remove all the drivers in safe mode using DDU. Then connect only the AMD cards and install the latest AMD drivers first. You then need to install the latest OpenCL runtime libraries from the AMD APP-SDK developer toolkit.
http://developer.amd.com/amd-accelerated-parallel-processing-app-sdkAfter all the AMD cards are detected and working, connect the Nvidia card and install the latest driver.
Also make the cards are not disabled with the -di parameter in the Claymore miner.