[Context: I have previously installed Android 4.4 r3 into a VM in Hyper-V and it is working correctly.]
I just installed Android 5.1 rc1 from iso into a VM in Hyper-V and though it installs and I see the opening setup screen, it responds incorrectly to mouse click. Clicking anywhere on the screen -- whether on the yellow arrow-button or anywhere else -- causes a circular disk to appear to the lower-left of the language selector -- see attachment. Upon first mouse click, the dot appears as shown, with that first click and subsequent clicks causing the dot to flash white then go back to as shown.
5.1-rc1 is deprecated.