1. http://answers.microsoft.com/en-us/windows/forum/windows_xp-files/windows-search-isnt-running/879683fa-895a-40ab-bb6b-d8cb16039968
2. Install 4.0 from http://www.microsoft.com/en-us/download/details.aspx?id=23
Be sure to ", use the Add or Remove Programs tool to remove the earlier version before you install Windows Search 4.0. "

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