retrieve registry value

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C#

C#4.0

I am trying to retrieve Every visit to the page value using it's registry but i am unable to retrieve the value, so please help me in resolving this issue.

My code is

RegistryKey reg = Registry.LocalMachine.OpenSubKey(@"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings \vSyncMode5 \t REG_DWORD \d 3 \f
", true);
    string currentKey;
    currentKey = reg.GetValue("Isregistered", true).ToString();
    if (currentKey == "yes")
    {
        Label1.Text = currentKey;
    }
    else
    {
        Label1.Text = currentKey;
       // Console.WriteLine("Not availble");
    }

i am getting object refrence not set to an intsance of an object, so please help me in resolving the problem.