Add check for Virtual Machine Platform to prepare script

Vagrant/prepare.ps1

@@ -253,6 +253,14 @@ function preflight_checks {
   else {
     Write-Host '  ['$($checkmark)'] The vagrant-reload plugin is installed' -ForegroundColor green
   }
+
+  # Warn if Virtual Machine Platform is enabled
+  Write-Host ''
+  Write-Host '[+] Checking if Virtual Machine Platform is enabled...'
+  if ((Get-WindowsOptionalFeature -Online -FeatureName "VirtualMachinePlatform").State -eq "Enabled") {
+    Write-Host '  [-] The "Virtual Machine Platform" Windows feature is enabled on your computer and is known to cause issues with starting Virtualbox VMs' -ForegroundColor yellow
+    Write-Host '  [-] If you experience issues with Virtualbox, it is recommended to disable it by running "optionalfeatures" from the run prompt and unchecking "Virtual Machine Platform".' -ForegroundColor yellow
+  }
 }