[2.0] Registry, need help.

[high6]

Ok well I got my program reading from registry using

Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.Users;
textBox1.Text = rk.GetValue("vBull cookie").ToString();

now it errors, "Object reference not set to an instance of an object." im guessing that is because the registry doesn't exist. Is there a way to check for a registry and set it? or is there something else wrong?