из всего скрипта тебе надо проверить вот это :
$properties = "Version","Caption","BuildNumber","CSDVersion","ServicePackMajorVersion","ServicePackMinorVersion","SerialNumber","InstallDate","WindowsDirectory","TotalVisibleMemorySize"
$items = Get-WMIObject -Namespace "root\cimv2" -Class "Win32_OperatingSystem" -ComputerName $NetworkName -Property $properties -ErrorAction Stop