It's alt+f4 like on all windows versions
Last edited by Cliff S; 17 Jan 2015 at 10:36. Reason: more info
If your function keys are assigned to something else then press the Fn key with them (you can always switch this behavior).
If you are really having problems shutting down you can also right click on the windows icon to shutdown or select "shutdown" from the metro screen or even just press the off button. It isn't terribly complicated.
On my W8.1 Desktop Alt-F4 brings up that shutdown screen.
I use an shutdown icon created on my desktop . if you want to too,just right click on the desktop choose shortcut ,and copy this in to the first box , shutdown.exe /s /t 0 , then In the next box type, shutdown ,click ok .then right the new icon and go to change icon ,and in the list of icons I find a big red X and use that .
not sure if it will in the VM though ,cant hurt to try