Use backslash(\
), not forward slash(/
). And _winreg.DeleteKey
requires at least two argument.
import _winreg
Key_Name = r'Software\Qube Cinema\QubeMaster Pro'
key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, Key_Name, 0, _winreg.KEY_ALL_ACCESS)
_winreg.DeleteKey(key, 'Test1')