See if this MSKB helps you resolve the issue -
Error code: 0x8007042c "Windows firewall cannot change some of your
settings" when you try to turn on your Windows Firewall
http://support.microsoft.com/kb/2530126
MowGreen
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*-343-* FDNY
Never Forgotten
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"Security updates should *never* have *non-security content* prechecked