This message was posted on behalf of Intel Corporation
On the following link you will find the graphics driver for Intel® HD Graphics 4600 using Windows® 10 64 bit:
Now, based on the error message you are getting: “this operating system is not supported” that seems to be related to the laptop not supporting Windows ® 10.
This PC came with Windows® 10 or you did an upgrade for the operating system?
Did you check with Alienware if Windows® 10 is fully compatible with this laptop?
Regarding the video card, when you use a video card the onboard graphics get disable, so, the graphics of the processor are not being used, and in that case the drivers needed are the ones that belong to the Nvidia Card, you can find the Nvidia drivers on the following link:
Also, if the problem persists after trying those drivers, then the best thing to do will be to contact Alienware directly:
Alienware Support: 1 800-254-3692