I have one client in my environment, a 2008 R2 server, that won't update virus definitions from the management servers
I have tried repairing the client, and the issue still is there.
Error in the SEP system log on the client is:
A LiveUpdate session encountered errors. 1 update(s) were available. 0 update(s) installed successfully. 1 update(s) failed to install.
An update for Virus and Spyware Definitions Win64 from LiveUpdate failed to install. Error: Prepackage callback failed (200)