Error: "Class Not Registered" When You Try to Search

When you try to search with Windows Search, you get an error that looks similar to this:

Class Not Registered, ClassID(a string of numbers and letters)

Cause

You'll get this error if you're using an older version of Windows (like XP) and the Windows Desktop Search engine isn't installed.

Solution

You can download Windows Desktop Search for free from Microsoft:

Download Windows Desktop Search »

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