Sigh... and I thought posting on forums would be helpful...
Intel is currently working on issues related with Graphics in Windows 10 , let's hope that with the upcoming releases this could be fixed. In the meantime you can refer to next post Re: -NEW- Intel® Iris™, Iris™ Pro, and HD Graphics Production Driver for Windows* 10 64-bit 220.127.116.11.4256 see post #93.
Thanks, edited the first post! Your reply was surely reassuring.