Hyper-V: This script takes a vhdx file and automatically creates a new VM based off it. All permissions are fixed after the VHDX gets copied.

newvm.ps1

<#  
Script: newvm.ps1
Description: Script to automagically create new VM from a template VM
Usage from CMD: powershell -noexit "& "newvm.ps1"
#>

## Configure Variables Here ##
[String]$templateVMName = "Template.vhdx"
[String]$templateVMPath = "D:\Hyper-V\VHD\"
[String]$setNIC = "Broadcom Netxtreme 57xx Gigabit Controller - Virtual Switch"
## ------------------------ ##


#Ask for name of New VM instance
[string]$newVMName = Read-Host 'New VM Name'

#Remove invalid user input (AlphaNumeric only)
[System.Text.RegularExpressions.Regex]::Replace($newVMName,"[^1-9a-zA-Z_]","");

#Copy Template VHD to new VHD
Copy-Item $templateVMPath\$templateVMName $templateVMPath\$newVMName.vhdx

#Create New VM & add 2 cores
New-VM -Name $newVMName -MemoryStartupBytes 512MB -Generation 1 -VHDPath $templateVMPath\$newVMName.vhdx -SwitchName $setNIC
SET-VMProcessor -VMname $newVMName -count 2

#Fix VHD permissions
[String]$newVMGUID = get-vm -Name $newVMName| Select-Object Id | Select -Expand Id #>
$filePath = $templateVMPath + $newVMName + ".vhdx"
$Username = "`"NT VIRTUAL MACHINE\$newVMGUID`""
icacls ("$filePath") /grant ("$Username" + ':(F)')