Are you logged in as an Administrator group account? Without that you can't write to Local Machine only to the user keys.

+++ Rick ---

>Hi guys,
>i am trying to create a registry key in my code but i keep getting system.unauthorizedaccessexception occured in mscorlib.dll , cannot write to registry key.
>
>here is my code
>
>using Microsoft.Win32;
>
>RegistryKey Hklm = Registry.LocalMachine;
>RegistryKey HkSoftware = Hklm.OpenSubKey("Software");
>// errror on the line below
>RegsitryKey Hkmycompany = Hkml.CreateSubKey("mycompany");
>
>Can anyone help me.
>
>TIA