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Manually updating definitions

Created: 12 Feb 2008 • Updated: 02 Mar 2009
Is there a way to roll back, or delete the most current defintions?  It appears I have a problem with registry write failures, process failures, and auto protect blocking access to message bodies all because of corrupt definitions.  I was wondering how to go about a fresh install of an already installed definition file or manually install an older set?  Thanks.
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