EnsureAdminPrivileges.ps1

function EnsureAdminPrivileges([String]$mesageOnError)
{
    $identity = [Security.Principal.WindowsIdentity]::GetCurrent()
    $principal = new-object Security.Principal.WindowsPrincipal $identity
    if (!($principal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)))
    {
        Write-Error $mesageOnError
        throw
    }
}