Why I can't delete key at HKLM?

I'm use RegDelnode(HKEY_LOCAL_MACHINE, TEXT("Software\\Test")); It's from MSDN and it worked good for HKCU, but i'm think that i must to set privileges. If I right, which privileges i mus开发者_如何学Ct to set on? Program write on c++ builder (if that helps).

To modify stuff in the HKLM branch your application must run with administrator privileges. Otherwise, changes to this branch are not permitted.