Detect a pending reboot and restart computer

Reboot-IfNecessary.ps1

$registryKey = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey("SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired");
if ($null -ne $registryKey){
  if ($registryKey.GetValueNames().Length -ne 0)          {
    Write-Host "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired indicates a pending reboot.";
    Write-EventLog –LogName Application –Source $EventLogSourceName –EntryType Information –EventID 99 –Message "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired indicates a pending reboot.";
    Restart-Computer -Force
  }
}

$registryKey = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey("SOFTWARE\Microsoft\Updates");
if ($null -ne $registryKey){
  $updateExeVolatile = $registryKey.GetValue("UpdateExeVolatile");
  if ($null -ne $updateExeVolatile)          {
    Write-Host "HKLM\SOFTWARE\Microsoft\Updates\UpdateExeVolatile indicates a pending reboot.";
    Write-EventLog –LogName Application –Source $EventLogSourceName –EntryType Information –EventID 99 –Message "HKLM\SOFTWARE\Microsoft\Updates\UpdateExeVolatile indicates a pending reboot.";
    Restart-Computer -Force
  }
}