windows defender turns itself off


my pc runs xp sp2. my antivirus is avg 2011 free version.
i recently installed windows defender and set it to be ON.
each time i start my pc i get a message "windows defender is off" and invites me to turn it on again.
why does windows defender get switched off ??
any ideas ??
thankyou
lescargot



windows defender keeps switching otself off !!

my pc runs xp sp2 with "avg 2011 free" antivirus.
i recently installed windows defender.
each time i start my pc i get a message"windows defender is turned off, do you want to turn it on".
why is windows defender turning itself off ??
thankyou
lescargot

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