Schedule Computers For Reboot

Here's a script you can schedule that will download and install updates. It's heavily cribbed from an MSDN example.

var wusSession;
var wusSearcher;
var wusSearchResult;
var iCounter;
var wshShell;
var wusUpdate;
var wusDownloadCollection;
var wusDownloader;
var wusInstallCollection;
var wusInstaller;
var wusInstallerResult;
var oError;
var sEventText;
var sResultText;
var oWMIService;
var oOSSet;
var eOSSet;
var oOS;

var EVENT_ERROR = 1;
var EVENT_WARNING = 2;
var EVENT_INFORMATION = 4;
var RESULT_NOTSTARTED = 0;
var RESULT_INPROGRESS = 1;
var RESULT_SUCCEEDED = 2;
var RESULT_SUCCEEDEDWITHERRORS = 3;
var RESULT_FAILED = 4;
var RESULT_ABORTED = 5;

//create a shell object for event logging
wshShell = WScript.CreateObject("WScript.Shell");

//log the start of the script
wshShell.LogEvent(EVENT_INFORMATION, "Scripted updates install starting.");

//create a WUS update session
try {
 wusSession = WScript.CreateObject("Microsoft.Update.Session");
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to create a WUS Session. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//create a WUS update searcher
try {
 wusSearcher = wusSession.CreateUpdateSearcher();
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to create a WUS update searcher. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//search for uninstalled updates for this machine
try {
 wusSearchResult = wusSearcher.Search("IsInstalled = 0");
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to search for updates. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//quit the script if there are no updates found for this machine
if (wusSearchResult.Updates.Count == 0) {
 wshShell.LogEvent(EVENT_INFORMATION, "No updates found.");
 wshShell.LogEvent(EVENT_INFORMATION, "Scripted updates install finished.");
 WScript.Quit();
}
else {
 //updates were found. Write out an event log detailing the found updates
 sEventText = wusSearchResult.Updates.Count + " uninstalled updates found:\n";
 for (iCounter = 0;iCounter < wusSearchResult.Updates.Count;iCounter++) {
  sEventText += wusSearchResult.Updates.Item(iCounter).Title + '\n';
 };  
 
 wshShell.LogEvent(EVENT_INFORMATION, sEventText);
};

//create a collection of updates to download from the WUS server
try {
 wusDownloadCollection = WScript.CreateObject("Microsoft.Update.UpdateColl");
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to create a download collection. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//loop through the collection of required updates and add them
//to an update collection
for (iCounter = 0;iCounter < wusSearchResult.Updates.Count;iCounter++) {
 wusDownloadCollection.Add(wusSearchResult.Updates.Item(iCounter));
};

//create a WUS downloader
try {
 wusDownloader = wusSession.CreateUpdateDownloader();
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to create a WUS download object. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//assign the collection of required updates to the downloader
wusDownloader.Updates = wusDownloadCollection;

//download the updates
try {
 wusDownloader.Download();
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to download updates. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//create a collection of updates to install
try {
 wusInstallCollection = WScript.CreateObject("Microsoft.Update.UpdateColl");
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to create an installer collection. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//loop through the collection of required updates and add them
//to the installation collection if they have been downloaded
for (iCounter = 0;iCounter < wusSearchResult.Updates.Count;iCounter++) {
 if (wusSearchResult.Updates.Item(iCounter).IsDownloaded == true) {  
  wusInstallCollection.Add(wusSearchResult.Updates.Item(iCounter));
 };
};

//create a WUS installer
try {
 wusInstaller = wusSession.CreateUpdateInstaller();
}
catch(oError) {
 wshShell.LogEvent(EVENT_ERROR, "Unable to create a WUS installer. Error " + oError.number + ". " + oError.message);
 wshShell.LogEvent(EVENT_WARNING, "Scripted updates install stopped.");
 WScript.Quit();
};

//set the updates to be installed to the WUS install collection
wusInstaller.Updates = wusInstallCollection;

//install the udpates
wusInstallerResult = wusInstaller.Install();

//log the installation results
sEventText = "Installation results:\n";
for (iCounter = 0;iCounter < wusInstallCollection.Count;iCounter++) {
 sEventText += wusInstallCollection.Item(iCounter).Title + ": ";
 
 switch (wusInstallerResult.GetUpdateResult(iCounter).ResultCode) {
  case RESULT_NOTSTARTED:
   sResultText = "Not started";
   break;
  case RESULT_INPROGRESS:
   sResultText = "In progress";
   break;
  case RESULT_SUCCEEDED:
   sResultText = "Succeeded";
   break;
  case RESULT_SUCCEEDEDWITHERRORS:
   sResultText = "Succeeded with errors";
   break;
  case RESULT_FAILED:
   sResultText = "Failed";
   break;
  case RESULT_ABORTED:
   sResultText = "Aborted";
   break;
  default:
   sResultText = "Unknown result";   
 };
 sEventText += sResultText + '\n'; 
};

wshShell.LogEvent(EVENT_INFORMATION, sEventText);

//reboot the machine, if necessary
if (wusInstallerResult.RebootRequired == true) {
 wshShell.LogEvent(EVENT_INFORMATION, "Scripted updates install finished. Initiating a reboot to complete update installation.");
 //reboot code
 oWMIService = GetObject("winmgmts:{(Shutdown)}");
 oOSSet = oWMIService.instancesof("win32_operatingsystem");
 eOSSet = new Enumerator(oOSSet);
 
 for (;!eOSSet.atEnd();eOSSet.moveNext()) {
  oOS = eOSSet.item();
  oOS.Win32Shutdown(6);
 };
}
else {
 wshShell.LogEvent(EVENT_INFORMATION, "Scripted updates install finished.");
};