function updateWinReg()
{
  //Notes:
  // can't use a double backslash before subkey - Windows already puts it in.
  // subkeys have to exist before values can be put in.
  var winreg = getWinRegistry();
  var subkey;  //the name of the subkey you are poking around in
  var valname; // the name of the value you want to look at
  var value;   //the data in the value you want to look at.

  if(winreg != null) 
  {
    winreg.setRootKey(winreg.HKEY_LOCAL_MACHINE);
    subkey  = "SOFTWARE\\$CompanyName$";
    winreg.createKey(subkey,"");

    subkey  = "SOFTWARE\\$CompanyName$\\$ProductName$";
    winreg.createKey(subkey,"");

    valname = "CurrentVersion";
    value   = "$UserAgent$";
    err     = winreg.setValueString(subkey, valname, value);

    subkey  = "SOFTWARE\\$CompanyName$\\$ProductName$\\$UserAgent$";
    winreg.createKey(subkey,"");

    subkey  = "SOFTWARE\\$CompanyName$\\$ProductName$\\$UserAgent$\\Main";
    winreg.createKey(subkey,"");

    valname = "Install Directory";
    value   = fCommunicator;
    err     = winreg.setValueString(subkey, valname, value);

    subkey  = "SOFTWARE\\$CompanyName$\\$ProductName$\\$UserAgent$\\Uninstall";
    winreg.createKey(subkey,"");

    valname = "Uninstall Log Folder";
    value   = szUninstall;
    err     = winreg.setValueString(subkey, valname, value);

    valname = "Description";
    value   = "$ProductName$ $UserAgentShort$";
    err     = winreg.setValueString(subkey, valname, value);
  }
}

// main
var srDest;
var err;
var szUninstall;
var fUninstall;
var fCommunicator;
var fWindowsSystem;
var fileComponentReg;
var fileComponentRegStr;

srDest = $SpaceRequired$:bin;
err    = startInstall("Mozilla XPCom", "XPCom", "$Version$"); 
logComment("startInstall: " + err);

fCommunicator  = getFolder("Communicator");
fWindowsSystem = getFolder("Win System");
logComment("fCommunicator: " + fCommunicator);

// build the uninstall folder path
szUninstall = fCommunicator + "Uninstall";
fUninstall  = getFolder("file:///", szUninstall);
File.dirCreate(fUninstall);

// Log component.reg and xpcom.log files so it can be deleted by
// the uninstaller.
// These two files are created after installation is done, thus
// are normally not logged for uninstall.
logComment("Installing: " + fCommunicator + "component.reg");

if(verifyDiskSpace(fCommunicator, srDest) == true)
{
  setPackageFolder(fCommunicator);
  err = addDirectory("",
                     "$Version$",
                     "bin",              // dir name in jar to extract 
                     fCommunicator,      // Where to put this file (Returned from GetFolder) 
                     "",                 // subdir name to create relative to fCommunicator
                     true);              // Force Flag 
  logComment("addDirectory() of Program returned: " + err);

  // check return value
  if(!checkError(err))
  {
    fileComponentRegStr = fCommunicator + "component.reg";
    fileComponentReg    = getFolder("file:///", fileComponentRegStr);
    err                 = fileDelete(fileComponentReg);
    logComment("fileDelete() returned: " + err);

    updateWinReg();

    err = finalizeInstall(); 
    logComment("finalizeInstall() returned: " + err);
  }
}

// end main