function CreateAppPool($poolName,$userName,$password)
{
    [wmiclass] $appPoolSettings ="root\MicrosoftIISv2:IISApplicationPoolSetting";
    $newPool = $appPoolSettings.CreateInstance();
    $newPool.Name ="W3SVC/AppPools/" + $poolName;
    $newPool.WAMUsername = $userName;
    $newPool.WAMUserPass = $password;
    $newPool.AppPoolIdentityType = 3;
    $newPool.Put();
    # Do it again if it fails as there is a bug with Powershell/WMI
    if (!$?)
    {
        $newPool.Put();
    }
}


function CreateWebsite($webSiteName, $path, $port, $appPoolName)
{
    [wmiclass] $bindingClass = 'root\MicrosoftIISv2:ServerBinding';
    $bindings = $bindingClass.CreateInstance();
    $bindings.Port = $port;
    $webService = Get-WmiObject -namespace"root\MicrosoftIISv2" -class"IIsWebService";
    $webSite = $webService.CreateNewSite($webSiteName, $bindings, $path);
    [int] $index = $webSite.ReturnValue.IndexOf("'") + 1;
    [int] $length = $webSite.ReturnValue.Length - $index - 1;
    [string] $websiteID = $webSite.ReturnValue.SubString($index, $length)  +"/root";
    $webVirtualDirSetting = Get-WmiObject -namespace"root\MicrosoftIISv2" -class"IIsWebVirtualDirSetting" | Where-Object {$_.Name -eq $websiteID};
    $webVirtualDirSetting.AppFriendlyName = $webSiteName;
    $webVirtualDirSetting.AppPoolId = $appPoolName;
    $webVirtualDirSetting.AccessFlags = 517;
    $webVirtualDirSetting.AuthFlags = 4;
    $webVirtualDirSetting.Put();

    #Switch the Website to .NET 2.0
    C:\windows\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -sn W3SVC/
}

$webSiteName ="MyWebsiteName";
$webSitePath ="C:\MyWebsitePath";
$webSitePort ="9001";
$appPoolName ="MyWebsitePool";
$appPoolIdentity ="MYDESKTOP\MyWebsiteIdentity";
$appPoolPassword ="MyWebsitePassword";

CreateAppPool $appPoolName $appPoolIdentity $appPoolPassword
CreateWebsite $webSiteName $webSitePath $webSitePort $appPoolName