I hold Windows Vista on my laptop & ending Thursday (5/24) the Yahoo IM stopped working. Why ?

Answer:

Windows Vista have a bug it it which deleted the .temp wallet created when you log on to the Yahoo IM. As the R&D Team is working on it , I would suggest to uninstall the IM and reinstall the Windows Vista version of equal.
vista has a entry that deletes the .temp wallet created when you log on
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