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Solution 1:

Change your app pool account from “Network Service” to Domain account.

Solution 2:

Upgrade Latest SP2 to Moss Server.
URL: http://blogs.msdn.com/b/sharepoint/archive/2009/06/25/service-pack-2-update.aspx

Solution 3:

1. Open the associated web.config
2. Make any change and undo it
3. Save the web.config