Posted by Sameer
Some users appear to be removing an blunder 8100030d when they try signing in to Windows Live Messenger, in a little cases after they have upgraded to a ultimate version. This blunder can be caused if a cache files get depraved as well as a resolution is to simply undo a cache.
Click a following couple for finish troubleshooting instructions for this blunder http://messenger-support.spaces.live.com/blog/cns!8B3F39C76A8B853F!13937.entry. (Special interjection to Jonathan) 
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Windows Live Messenger January 15th 2009