Error: 643 Code installation of an update for silverlight

I receive an error when it tried to install the update no. KB974331 from windows update with error code 643. What can I do?, is important this update?

Installation you may need fixing-

See: How to manually clean a broken Silverlight installation
http://blogs.msdn.com/rpomeroy/archive/2008/06/10/how-to-manually-clean-up-a-bad-Silverlight-installation.aspx

Then try again. TaurArian [MVP] 2005-2010 - Update Services

Tags: Windows

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