One or more prerequisites for protecting this data source is missing. Ensure that the following prerequisite software is ...

One or more prerequisites for protecting this data source is missing.
Ensure that the following prerequisite software is installed on %ServerName; and/or all nodes in the cluster:

Windows Server 2003 SP1 with Knowledge Base article 940349 (http://go.microsoft.com/fwlink/?LinkId=99034)
        - OR � 
Windows Server 2008 (http://go.microsoft.com/fwlink/?LinkId=128812) 

If you have already installed the required prerequisite, refresh the agent status in the management tab and try again.