RE: Error 8000401a - Windows Live Messenger 2009 (14.0.8050.1202) :) Suyesh or egghead, thanks! you're the best... For rookies: Begin--> run--> regedit--> enter--> Go to edit--> search --> 380689D0-AFAA-47E6-B80E-A33436FE314B --> enter --> Just delete that selected key. any mistake... sorry! i'm tuga! lol