no I only had vis c++ 2013 but I have just installed 2015 and cpp-ethereum, do I need to go through building again? https://github.com/ethereum/webthree-umbrella/wiki/Building-on-Windows
Did you try the other things I suggested? You do not need to build anything. Use the ethminer in the link I gave you. Add --opencl--platform 1 to the end of your bat. Try to mine.
not I am not using onboard graphics, yes I did as you suggested and the new ethminer is still crashing