The Intel® Iris™, Iris™ Pro, and HD Graphics are currently supported by Windows 10. However, I would be very grateful if you could tell me model of your Intel® Iris Graphics, please.
I would like to share with you the following link, where you will be able to check a comprehensive list of supported operating systems on a per-processor/graphics technology basis.
In addition to this, here is the link where you can also download the graphic driver or check the information released regarding this topic.
Intel® Iris™, Iris™ Pro, and HD Graphics Production Driver for Windows® 7, 8.1, & 10
You can consider installing that update from the Intel® Driver Update Utility.
I hope you have a chance to look over this links. If we can be of more help, please feel free to contact us.