Unfortunately, according to the policy document, the Alienware M1xXR2 series will not be supported on Windows 10. Some users have successfully installed Windows 10 on these non-supported systems, but they did all the driver investigation (example: installing 7/8/8.1 drivers) to force it to work. Dell does not have the resources to do this on non-supported systems. You could also try posting this on the Notebook Review and Alienware Arena forums for assistance.
Dell | Alienware Technical Support
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I have an Alienware Area 51 ALX desktop (2009). I was getting blue screens on my many attempts to install Win 10 and thought I was limited to Win 7. It was suggested a new fresh install on a new hard drive was a possibility. I bought a new 480GB SSD created a Win 10 .iso CD and did just that and all is working great. Good luck. By the way. GET ACONIS. It is a life saver!