The Indexing Service filter daemon keeps crashing on my Windows XP Pro machine, with the following error message:

Indexing Service filter daemon has encountered a problem and needs to close.  
We are sorry for the inconvenience.

Not a big deal, I can click "Don't Send Error Report" all day. But what's going on, here? Is this a service that I need? Is the frequent crashing indicative of something worse that's happening behind the scenes?

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