Reference VM configuration
A common problem that system administrators will run into is the installed memory of your VM and Windows PE's requirement of 768 MB. Hyper-V, by default, will give a VM only 512 MB and the dynamic memory driver will not service Windows PE either.
Currently, this manifests in my lab, as shown in the following screenshot:
Simply increasing the system-installed memory in your VM to over 768 MB should remediate the memory problem, and Windows PE from your MDT share will function properly. To avoid this, I'd just set it to 1 GB or more.
