I'm going through the same thing :'(
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I've noticed your posts and we seem to be having more or less the same problem.
Hopefully someone will give us some advice....I'm getting real nervous about having no protection for going on three days now

Windows XP.
Was prompted to update from older version....did so....but system wont actually start running
Status reads: Unsecured, but wont respond to "fix now" or "start program".
System shields all read "unknown" and when you hit start say "system shield unreachable"
Update definitions and virus definitions all read "unknown"
I have rebooted, and un-installed and reinstalled....no change.
Tried update, and it just responds that the service is not running.
I am NOT computer wise....so any advice needs a step by step...and possible baby talk