Delete registry key in 64 system 

import _winreg;
subkey=r'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall';
key =_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,subkey,0, (_winreg.KEY_WOW64_64KEY + _winreg.KEY_ALL_ACCESS));
_winreg.DeleteKey(key,'{66203F34-7EA5-4D68-B9C3-76A156212D5B}');



Delete registry key in 32 bit system

import _winreg;
subkey=r'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall';
key =_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,subkey,0, _winreg.KEY_ALL_ACCESS);
_winreg.DeleteKey(key,'{66203F34-7EA5-4D68-B9C3-76A156212D5B}');