error code 0x8004FF83-update for KB2804527

[AWS]

I use Microsoft Security Essentials and download updates daily. The update KB2804527 has dowloaded (3/7,3/10,3/13/12 &amp3/13/13) but

WILL NOT install. Is there a fix for this? The message in the Security Center reads Virus Protection NOT FOUND.
Please HELP.
Many Thanks.
MEB

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