This forum is for the installed version of Windows Live One Care. You can get help with the Live Safety Scanner here -
http://boards.msn.com/safetyboards/board.aspx?BoardID=225 To answer your question, I would just ignore the results of the registry scsn. The first two items are probably obsolete software entries and the others are unused file extensions. Deleting those entries will not improve the performance of your computer one bit.
Jim
Microsoft MVP Consumer Security - Forum Moderator - Live One Care - Live Mesh - Microsoft Security Essentials