I need to change registry key permission from command prompt. I tried subinacl.exe from windows 2003 Resource Kit Tools. This is the command I am using: subinacl /subkeyreg \HKEY_LOCAL_MACHINE\SOFTWARE\ISDelta /grant=Users=f This the output: +subkeyreg \HKEY_LOCAL_MACHINE\SOFTWARE\ISDelta /grant=Users=f Elapsed Time: 00 00:00:00 Done: 0, Modified 0, Failed 0, Syntax errors 0 And of course the permissions aren't changed. I can't figure out what am I doing wrong. I tried as user that is administrator, and I tried as Administrator. Doesn't work. Can anyone help?