RE: Error 8000401a - Windows Live Messenger 2009 (14.0.8050.1202) Hi I found this Registry Hack which solved the problem. So wanted to share it with all of you Navigate to on regedit: HKEY_CLASSES_ROOT\AppID\ DELETE KEY: 380689D0-AFAA-47E6-B80E-A33436FE314B this is thanks to a post on egghead! Cheers!