Did you happen to do a custom install and check the 'Secure Virtual Machines' option or was it available ?
Can you give the specs of your system, e.g. CPU, RAM and HDD size ?
NG won't install if your system won't support it or is under resourced.
Previously, I didn't install it on my win7 netbook as I thought that was too under powered, yet at that time the resource requirement was quite low. Having not installed the 'Secure Virtual Machines' option, the DeepScreen has no sub options in the avastUI.