procedure TForm1.Button1Click(Sender: TObject);
var
Reg: TRegistry;
begin
Reg := TRegistry.Create;
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
if Reg.OpenKeyReadOnly('SOFTWARE\Microsoft\Windows NT\CurrentVersion') then
begin
ShowMessage(Reg.ReadString('RegisteredOwner'));
Reg.CloseKey;
end;
finally
Reg.Free;
end;
end;